I honestly thought there was nothing else I could learn about collimation, but this amazing video proved me wrong. You have given me solutions to at least three separate problems I was struggling with when collimating my newts! Thank You for posting THE BEST most easy to understand collimation video I've ever seen! 👌🔥👍
I loved the bit where you switched from a Cheshire to a collimated laser. So true, and it's why you can only trust a defocused star test. I tend to use a cheap laser which has been collimated on a V-block to get close, then star test for the final touches. Great explanation Biscuit!
Some things you should mention: The "basically you fiddle around" can easily take hours if you never did it before, and takes a few minutes if you are familiar with the process. New people should not despair, eventually they will figure it out! If your focuser does not point to the optical axis, and many don't as delivered, you will never get anywhere really, so that is step 1 for new telescopes, as is checking if the donut is actually at the center of the primary mirror. Other than that: Great video! For a long time I used a concenter followed by a laser and recently tried a DIY Ocal-like approach. Given my experience, it was way easier to use and understand, adjusting the focuser went very fast and the result was great. I was skeptical at first, but the experience convinced me to switch.
thx for that good point. Fyi I didn't think that the focuser not pointing at the optical axis merited being in the basic video as most scopes have oversized secondarys which partly compensate for the error. However of course its better to have it squared off so i do run through it in the advanced video and I found a poorly aligned focuser can cause the sensor to be tilted with respect to the mirror and this can potentially make star collimation very difficult. Plenty of free videos about squaring off the focuser out there. feel free to highlight one if you wish. and thx.
May I just remind my dear viewers that without patrons I wouldn't be able to make any videos. So I have made a longer advanced video as a way of thanking my patrons and as a way of gaining more patrons. If you don't think this is fair on those without the funds to become my patron then please post what you consider to be the best free newtonian collimation video below. I happen to think there is a lot of misinformation out there but I'm happy to support fellow youtubers who get it right. The video should include aligning the focuser, secondary mirror offset and how to check it, testing to see if your focuser can handle the weight of your camera and of course a good method of star collimation as those are the most important topics in my advanced video...
This is vital, especially to those new to Newtonian telescopes which some people may not understand and that this includes Dobsonians. I bought my first Newtonian almost 50 years ago and it took me a long time to understand everything about collimation, back then there was no internet and I didn't belong to an astronomy club. You might want to re-run this video once a year to make certain that it reaches each generation of amateur astronomers, it is that important. I suspect that a great many people simply gave up astronomy because of the lack of knowledge regarding collimating.
I'm still very new to telescopes and astronomy and the content of this video NEVER even crossed my mind as to why what I'm seeing in the eyepiece could be the reason for blurry or misaligned images... THANK YOU!
During lockdown i got excited about astronomy and bought a newtonian, spent too much, had a fiddle with the collimation and it never worked again, its been in the attic ever since! I bet theres loads of us lol
Yeh im sure fyi the advanced video takes you thru how to get it back into collimation.... but of course that is only available to patrons for £3 a month which judging by some of the comments makes me the prince of darkness😂
Thank you so much, this tutorial is the only one that really clicks for me. That one sentence you said about what the collimated display should look like in the cheshire was a perfect summary for me and I recite that sentence whenever I'm collimating
You have no idea how much this helped. I thought I ruined my first telescope, but after watching this video everything made sense!! I now have 2 focused telescopes!!!! Thank you sooooo much
There is no reason that a well made well collimated Newtonian should fall short of any other design , provided the central obstruction doesn't exceed 25% of the aperture. In 1995 I gave a talk on how to accurately collimate a Newtonian telescope. Your video is an excellent example on the subject!
Holy cow! I have a 10 inch dobsonian which has been sitting for 12 years.. Your video is great, and I'm feeling better about getting it up and going again. I know the mirrors are very dirty and I'm worried about how to get them properly cleaned, but once I conqure that, I feel very confident that I can collimate it... thank you very much!!
Being relatively new to astrophotography and only having used refractors before, colomation has always put me off newts but this easy guide is amazing and takes most of the fear away! Good job as always biscuit!
One of my first jobs delivered the money to buy me a telescope. The cheapest I could find. That night I was amazed at how fast the moon traveled out of view. The knobs to track didn't seem to work. It wobbled like the gear axles weren't dead center. There was a manual, but in a language I didn't understand. And the internet, or even BBS was not yet a thing. It was nice to see the moon up close, but with the biggest magnification, there were blue and pink lines contouring the moon. It took only a few weeks to get that disappointed I threw the telescope in the attic. It came down very few times. and somewhere in the 40 years following it got lost. So, now I see what went wrong, and it's not the "precision instrument you should *not* fiddle with" I thought it was.
EXCELLENT VIDEO!! Don't forget to keep the ota horizontal while adjusting the secondary mirror. This assures you won't accidentally drop a tool down the tube onto the primary mirror.
a concenter eyepiece such a good tool for getting the secondary positioned to the focuser accurately , you can also use a camera with software. good for dailing out any small errors for imaging .
I use the sleeve of an eyepiece, and the dust cap that attaches to it (with a hole in it), and I have a metal washer glued to the inside of the cap. It makes it a lot easier to see when you are actually close, and helps you get it a bit more accurate. And then I point the scope close to a light, like a ceiling bulb so that the washer reflects some of the light to illuminate the washer. But the funny thing is that I always find it easier to collimate when the primary is a lot out of whack, because I can see everything aligning gradually. Like, I had to clean my primary this evening, and when I put it back together it was way off, and I just turned a few of the knobs and then it was collimated about a minute later, and I was like WTH, it's done already? 🤣 It does take a while to get used to collimating though; when I first started out I was never quite sure what I was looking at through the collimator, with all the mirrors and reflections everywhere, but after a while your brain starts filtering out the secondary mirror and stuff, and it gets much easier.
Experienced visual observer here. All I use to collimate my Newtonian is an empty 35mm film container with a pin hole in the middle. Works brilliantly 🇦🇺
If you've never tried it, check out barlowed laser collimation. It's easy, doesn't cost anything if you've already got the laser and a barlow lens, and it eliminates a lot of the misalignment errors that are inevitable in a telescope.
Thank you for recommending a good laser collimator. I was losing my mind with the horrible one I bought off Amazon and had no idea why I couldn't get it collimated.
Collimating my 8 inch Newtonian has been the bane of my existence. I have a few laser collimators, but one of my challenges is that either the laser collimators are not collimated, or the focuser tube is not flat. If I spin the laser in the focuser, the red dot on the primary spins round and round with a radius of about a half inch (just as you showed in the video), I guess my next step is to build the laser collimator colllimator!
Fantastic video! One thing you might want to do is have a disclosure warning when looking thru a mirror with a laser pointed and looking right at it as precaution :D
the moment a paywall appears the content stops being so relevant and attractive, there are many free sources of info, and that's how a yt channel dies.
well im glad i now know how to pay my morgage.😂😂😂😂😂 but seriously youve got 16 mins of well explained newtonian collimation advice for free why are you complaining?
OMG... I remember seeing your channel with just a few thousand subscribers and I remember thinking "astrobiscuit" is such a perfect name for a channel. And look at your sub count now lol 😂 well done man!
Whilst collimating my GSO F5 newt, I noticed that the secondary mirror holder has indentations for the 3 screws, so you can't rotate it as you suggest. I've had this scope a few years and over time the collimation screws have ended up almost screwed all the way in and I realised that backing them way off, allowed me to tighten the centre screw which moves the mirror closer to the open end. This simple adjustment has made all the difference, the secondary is now positioned directly under the focuser.
Yes, those 3 screws MUST be adjusted to center the secondary under the focuser, otherwise you’ll get uneven field illumination. A laser isn’t enough to collimate the primary, the tolerances are well below fractions of a milimiter therefore unless the laser is barlowed it shouldn’t be used for the primary
I dont agree with everything you say. I think you need to check you fully understand secondary mirror offset. I must admit ive no idea why folks barlow their laser. Perhaps you could enlighten me. I see no advantage over a well collimated regular laser...
@@Astrobiscuit I do understand secondary offset, it offsets the secondary holder toward the primary and away from the focuser, intercepting the entire light cone of the primary allowing even field illumination. Anyways those 3 screws have nothing to do with offset, they are meant to center the secondary under the focuser, opticians know what the do, they haven’t installed the 3 screws to annoy us… The barlowed laser simply magnifies the laser spot on the target so it’s easier to read any miscollimation
The correct way to collimate the secondary mirror is to block the primary with a sheet of paper/card and place a sheet of coloured paper opposite the focuser. This allows for the secondary to be seen clearly. Position the secondary mirror so that it's perfectly centered in the focuser drawtube and perfectly round. Easily checked and confirmed by a concenter. Then and only then do you adjust the primary.
im afraid i don't think centering the secondary is a great thing to do in a fast newt. Fine for f5 ot six but i think an f4 newt the secondary should be pushed slightly forward towards the primary mirror by the secondary diameter / (4xfocal ratio) This is quite advanced though so i don't cover it in this basic tutorial.
@@AstrobiscuitAgreed 👍, however there's no standard placement for the secondary offset in fast newtonians. The offset is entirely dependent on the manufacturers design which should be easily confirmed.
Can anybody tell me if it's better to collimate with the eyepiece focuser extended all the way or not? Or if it even makes any difference either way... I'd appreciate it
I’ve always used a collimation cap and felt that one side of my image looks a bit soft. I tried a laser and it was super easy and I feel that my view is sharper edge to edge. However, when I put the collimation cap back in after using the laser, I can no longer see all the primary mirror clips in the reflection. Does anyone have thoughts on this?
But i cant see clearly the hair cross of the chesire my eyepiece its maybe too short i bought the short version of the chesire ( cheapest) my eye can't focus the cross and what is the correct position to see trough the hole?.
This is a random question but is there a way to computerize or atleast motorize a telescope without spending over €100 and if yes can you pls make a vid on it
How often do you have to colimate the laser? And I wonder how hard it would be to put a decent CMOS sensor in place of the secondary? Advantages: 1.brighter image due to no 2nd mirror loss, 2. No distortion from 2nd mirror, 3 no camera flex on the ota, 4. Potential passive sensor cooling as it could use the cooling of exposure to the night sky via heat sink or similar. Disadvantages: 1.possible heat distortion? 2. Wiring ribbon or equivalent needed for PSU & signal. 3. Collimation issues due to thermal expansion of sensor holder? PS. Love the video as always :)
I don’t understand when we need to collimate for the secondary mirror. I only make a simple collimation to the primary mirror using Polaris but I have never done anything to my primary mirror yet. So far I have no complaints but maybe I should?
This very thorough instructional video has put me off buying a Newtonian purely because I don't have the patience that you obviously need to keep the telescope functioning properly. Aren't there more compact versions (cassegrain?) that stay in line?
Great video but i have a question. People in the discord server are saying the laser is bad, should i listen and just buy the cheshire eyepiece or buy a collimation cap and laser collimator?
Hi Rory, I know this probably sounds like a dumb question, but how do you become a patreon member. I don't know what to click or where. I'd like to watch the rest of the video about star collimation. Thanks in advance
Unfortunately, many of the new Newtonians won't allow to adjust secondary tilt, because they put 3 pits into the 3 adjuster screw spots and many times the tilt is still incorrect. Lasers will also not fix tilt issues and won't show if there is a tilt with the secondary. The only way to find the tilt problem by looking at the shape of the primary mirror (reflected inside the secondary) with a Cheshire and recognizing the tilt, or using a special collimator camera. And to fix the tilt with those Newtonians, that won't allow tilt adjustment, the scope needs to be modified. There are some videos up in the youtube, someone doing just that, placing a large aluminum washer between the 3 adjuster screws and the secondary mirror's back and now the mirror can be rotated.
sorry but i think you (and loads of others) have got into a pickle. The only tilt i worry about is if the cameras sensor is tilted with respect to the primary. The secondary mirror is flat. It is optically inert. It just changes to angle the light travels from the primary.
Hey astrobiscuit I have a newtonian but when I take pictures the middle is really dark circle like possibly the shadow of secondary mirror is that normal? Or something wrong BTW there are no light leaks
Look up vignette this can cause what you describe. BBC sky at night web site has a piece on it. ‘What is vignetting?’ was my search term. Hope you get it sorted.
Hi, I have an honest question, I noticed Cassegrain scopes have a glass front with the secondary mirror, I was wondering how come Newtonians dont use the same glass front with their angled mirrors? seams like it would solve the diffraction spikes?
I loved your remark about how a single screw that holds the Cheshire eyepiece tends to hold it off axis. But doesn't that same screw hold your normal eyepieces, when you finally start viewing and after doing the collimation? Don't you want to reproduce exactly what your normal eyepieces see, from exactly the position they will be in? This is a great instructional video, I wish it was available when I did this on my 12" Newtonian years ago. So it was a refresher course, a delightful reproduction of what I went through at that time.
Is it about cause i had question about colimation on your discord server ?? If its, than thanks man for tutorial.. very appreciate.. thanks for your work..
![Collimation of Newton Telescope using [SVBONY] Laser & Cheshire](http://i.ytimg.com/vi/wgIhvsxyB1Y/mqdefault.jpg)
![Collimation of Newton Telescope using [SVBONY] Laser & Cheshire](/img/tr.png)
I honestly thought there was nothing else I could learn about collimation, but this amazing video proved me wrong. You have given me solutions to at least three separate problems I was struggling with when collimating my newts! Thank You for posting THE BEST most easy to understand collimation video I've ever seen! 👌🔥👍
Thank you. That is very rewarding to hear. 👍
I don’t have a telescope Yet I enjoy these
Get oneeee!!!😊
Same
I don't have one either.... But I do have a gambling problem 🫤
I have a small refractor for beginners but not a newtonian
I just got AWB 130p and IM IN LOVE WITH ASTRONOMY NOW
I loved the bit where you switched from a Cheshire to a collimated laser. So true, and it's why you can only trust a defocused star test. I tend to use a cheap laser which has been collimated on a V-block to get close, then star test for the final touches. Great explanation Biscuit!
mate much appreciated . you are an inspiration 👍
@@Astrobiscuit Dude! that means a lot coming from you mate :)
Some things you should mention: The "basically you fiddle around" can easily take hours if you never did it before, and takes a few minutes if you are familiar with the process. New people should not despair, eventually they will figure it out! If your focuser does not point to the optical axis, and many don't as delivered, you will never get anywhere really, so that is step 1 for new telescopes, as is checking if the donut is actually at the center of the primary mirror. Other than that: Great video! For a long time I used a concenter followed by a laser and recently tried a DIY Ocal-like approach. Given my experience, it was way easier to use and understand, adjusting the focuser went very fast and the result was great. I was skeptical at first, but the experience convinced me to switch.
thx for that good point. Fyi I didn't think that the focuser not pointing at the optical axis merited being in the basic video as most scopes have oversized secondarys which partly compensate for the error. However of course its better to have it squared off so i do run through it in the advanced video and I found a poorly aligned focuser can cause the sensor to be tilted with respect to the mirror and this can potentially make star collimation very difficult. Plenty of free videos about squaring off the focuser out there. feel free to highlight one if you wish. and thx.
Best collimation tutorial on YT. Thanks.
These Telescopes make my day better....
Astrobiscuit is definitely a good snack
May I just remind my dear viewers that without patrons I wouldn't be able to make any videos. So I have made a longer advanced video as a way of thanking my patrons and as a way of gaining more patrons. If you don't think this is fair on those without the funds to become my patron then please post what you consider to be the best free newtonian collimation video below. I happen to think there is a lot of misinformation out there but I'm happy to support fellow youtubers who get it right. The video should include aligning the focuser, secondary mirror offset and how to check it, testing to see if your focuser can handle the weight of your camera and of course a good method of star collimation as those are the most important topics in my advanced video...
This is the best, most informative collimation video on the internet! Well done.
This is vital, especially to those new to Newtonian telescopes which some people may not understand and that this includes Dobsonians. I bought my first Newtonian almost 50 years ago and it took me a long time to understand everything about collimation, back then there was no internet and I didn't belong to an astronomy club. You might want to re-run this video once a year to make certain that it reaches each generation of amateur astronomers, it is that important. I suspect that a great many people simply gave up astronomy because of the lack of knowledge regarding collimating.
Thank you Riktenstein for the incredible music. It can be calming and then intense. its a piece of art
I'm still very new to telescopes and astronomy and the content of this video NEVER even crossed my mind as to why what I'm seeing in the eyepiece could be the reason for blurry or misaligned images... THANK YOU!
During lockdown i got excited about astronomy and bought a newtonian, spent too much, had a fiddle with the collimation and it never worked again, its been in the attic ever since! I bet theres loads of us lol
Yeh im sure fyi the advanced video takes you thru how to get it back into collimation.... but of course that is only available to patrons for £3 a month which judging by some of the comments makes me the prince of darkness😂
@@AstrobiscuitAll hail the prince of darkness! Does that make you a digestive with plain chocolate on it?
Your so underrated you deserve 1 million subs
oh mate thanks. Really appreciate it.
Thank you so much, this tutorial is the only one that really clicks for me. That one sentence you said about what the collimated display should look like in the cheshire was a perfect summary for me and I recite that sentence whenever I'm collimating
You have no idea how much this helped. I thought I ruined my first telescope, but after watching this video everything made sense!! I now have 2 focused telescopes!!!! Thank you sooooo much
awesome. job done. 😁
There is no reason that a well made well collimated Newtonian should fall short of any other design , provided the central obstruction doesn't exceed 25% of the aperture. In 1995 I gave a talk on how to accurately collimate a Newtonian telescope. Your video is an excellent example on the subject!
Very cool that you made an episode for your rookie viewers !
I've got a laser collimator and thought that was that, until I learned thte laser collimator ITSELF needs collimating too! Always learning!
You almost let that telescope slide out of the dovetail saddle on your balcony 😅😎 You casually tighten it afterwards. Nice recovery Rory 💪
😂im always thinking about what im saying...
Thank you so much for this! You find so many guides on how to use a laser, but your video was the first to explain the simple collimation cap.
Holy cow! I have a 10 inch dobsonian which has been sitting for 12 years.. Your video is great, and I'm feeling better about getting it up and going again. I know the mirrors are very dirty and I'm worried about how to get them properly cleaned, but once I conqure that, I feel very confident that I can collimate it... thank you very much!!
الحلقة اللي كنت بإنتضارها 👏
Being relatively new to astrophotography and only having used refractors before, colomation has always put me off newts but this easy guide is amazing and takes most of the fear away! Good job as always biscuit!
ah thx bud
This was the collimation video i needed. Absolute legend, thanks a bunch!
One of my first jobs delivered the money to buy me a telescope. The cheapest I could find. That night I was amazed at how fast the moon traveled out of view. The knobs to track didn't seem to work. It wobbled like the gear axles weren't dead center. There was a manual, but in a language I didn't understand. And the internet, or even BBS was not yet a thing.
It was nice to see the moon up close, but with the biggest magnification, there were blue and pink lines contouring the moon. It took only a few weeks to get that disappointed I threw the telescope in the attic.
It came down very few times. and somewhere in the 40 years following it got lost.
So, now I see what went wrong, and it's not the "precision instrument you should *not* fiddle with" I thought it was.
Thanks so much for this video! I've been struggling with collimation for months now, but this helped me finally complete the job.
EXCELLENT VIDEO!! Don't forget to keep the ota horizontal while adjusting the secondary mirror. This assures you won't accidentally drop a tool down the tube onto the primary mirror.
yes very true
a concenter eyepiece such a good tool for getting the secondary positioned to the focuser accurately , you can also use a camera with software. good for dailing out any small errors for imaging .
I use the sleeve of an eyepiece, and the dust cap that attaches to it (with a hole in it), and I have a metal washer glued to the inside of the cap. It makes it a lot easier to see when you are actually close, and helps you get it a bit more accurate.
And then I point the scope close to a light, like a ceiling bulb so that the washer reflects some of the light to illuminate the washer.
But the funny thing is that I always find it easier to collimate when the primary is a lot out of whack, because I can see everything aligning gradually. Like, I had to clean my primary this evening, and when I put it back together it was way off, and I just turned a few of the knobs and then it was collimated about a minute later, and I was like WTH, it's done already? 🤣
It does take a while to get used to collimating though; when I first started out I was never quite sure what I was looking at through the collimator, with all the mirrors and reflections everywhere, but after a while your brain starts filtering out the secondary mirror and stuff, and it gets much easier.
OMG - I just changed my focuser and have been going MAD trying to get it to a point where I'm satisfied I've done it right. I hope this helps.
im afraid thats in the advanced section. just look up using a laser collimator to check your focuser us pointing straight.
Experienced visual observer here. All I use to collimate my Newtonian is an empty 35mm film container with a pin hole in the middle. Works brilliantly 🇦🇺
Finally the real tutorial
I love how you described as to these people man you’re saving thousands of dollars you know that right I hope they kick you five bucks a month
If you've never tried it, check out barlowed laser collimation. It's easy, doesn't cost anything if you've already got the laser and a barlow lens, and it eliminates a lot of the misalignment errors that are inevitable in a telescope.
Thank you for recommending a good laser collimator. I was losing my mind with the horrible one I bought off Amazon and had no idea why I couldn't get it collimated.
Dont have a telescope, yet I found your explanations of the mechanics and techniques very interesting! Brilliant video as always!
wow... that is suprising. i feel you must be a true nerd at heart. 🤣
Collimating my 8 inch Newtonian has been the bane of my existence. I have a few laser collimators, but one of my challenges is that either the laser collimators are not collimated, or the focuser tube is not flat. If I spin the laser in the focuser, the red dot on the primary spins round and round with a radius of about a half inch (just as you showed in the video), I guess my next step is to build the laser collimator colllimator!
that means your laser collimator needs collimating... see the rig i use in the video. The focuser may be fine... there is a different check for that.
FANTASTIC vid, Breaker! This one came out of nowhere and super glad it did. 'biscuit FTW!
😂
Astrobiscuit my savior
Fantastic video! One thing you might want to do is have a disclosure warning when looking thru a mirror with a laser pointed and looking right at it as precaution :D
true... Ive actually caught the laser. I wonder if they're designed to be not TOO dangerous. Hope so.
What perfect finding😂😂 I just got my 8inch dob last week
Hello finally back
the moment a paywall appears the content stops being so relevant and attractive, there are many free sources of info, and that's how a yt channel dies.
well im glad i now know how to pay my morgage.😂😂😂😂😂 but seriously youve got 16 mins of well explained newtonian collimation advice for free why are you complaining?
@@Astrobiscuit well i'm not complaining honestly, just gaving you some advice for free!
OMG... I remember seeing your channel with just a few thousand subscribers and I remember thinking "astrobiscuit" is such a perfect name for a channel. And look at your sub count now lol 😂 well done man!
Very instructive - thanks, Astrobiscuit.
Great explanation and vid, thanks.
Well done mate
For everyone using a laser collimator: Check the laser class! It can cause damage to the eyes!
yup, people really shouldn't be touching something stronger than a Class II imho unless they really need the power or are laser enthusiasts.
@@xander1052 I was somewhat shocked when I noticed mine has class 3.....
8:08 the primary mirror end of that particular Newt looks pretty damn steampunk.
I colimate my Newton with my laser every time I set it up for photography. The 5 minutes are really worth it.
I'm further reminded why I don't use Newtonians :). Clears skies!
😂
Good video very informative.
Whilst collimating my GSO F5 newt, I noticed that the secondary mirror holder has indentations for the 3 screws, so you can't rotate it as you suggest. I've had this scope a few years and over time the collimation screws have ended up almost screwed all the way in and I realised that backing them way off, allowed me to tighten the centre screw which moves the mirror closer to the open end. This simple adjustment has made all the difference, the secondary is now positioned directly under the focuser.
I'm sorry, but that thumbnail is just amazing 😂
Thank you very much, very interesting and helpful presentation.
I've found my problems were with the secondary . Once I learned how to aline the secondary mirrors life became better😊
Yes, those 3 screws MUST be adjusted to center the secondary under the focuser, otherwise you’ll get uneven field illumination. A laser isn’t enough to collimate the primary, the tolerances are well below fractions of a milimiter therefore unless the laser is barlowed it shouldn’t be used for the primary
I dont agree with everything you say. I think you need to check you fully understand secondary mirror offset.
I must admit ive no idea why folks barlow their laser. Perhaps you could enlighten me. I see no advantage over a well collimated regular laser...
@@Astrobiscuit I do understand secondary offset, it offsets the secondary holder toward the primary and away from the focuser, intercepting the entire light cone of the primary allowing even field illumination.
Anyways those 3 screws have nothing to do with offset, they are meant to center the secondary under the focuser, opticians know what the do, they haven’t installed the 3 screws to annoy us…
The barlowed laser simply magnifies the laser spot on the target so it’s easier to read any miscollimation
Cool. A real-life mad scientist 👍
The correct way to collimate the secondary mirror is to block the primary with a sheet of paper/card and place a sheet of coloured paper opposite the focuser. This allows for the secondary to be seen clearly. Position the secondary mirror so that it's perfectly centered in the focuser drawtube and perfectly round. Easily checked and confirmed by a concenter. Then and only then do you adjust the primary.
im afraid i don't think centering the secondary is a great thing to do in a fast newt. Fine for f5 ot six but i think an f4 newt the secondary should be pushed slightly forward towards the primary mirror by the secondary diameter / (4xfocal ratio) This is quite advanced though so i don't cover it in this basic tutorial.
@@AstrobiscuitAgreed 👍, however there's no standard placement for the secondary offset in fast newtonians. The offset is entirely dependent on the manufacturers design which should be easily confirmed.
It's a good idea for secondary collimation to have three Allen keys, one for each screw. That way you don't have to keep moving one key around.
That’s a good idea. I’m looking at replacing mine with knurled head screws so I can just use my fingers.
Thanks, bro
thanks
Love your videos, when's the next due?
Bedankt
Thank you😁
I'm not interested in the topic as much as the others. I don't have a telescope. I just come for the enthusiasm. I press like before the video starts.
Nice tutorial
Can anybody tell me if it's better to collimate with the eyepiece focuser extended all the way or not? Or if it even makes any difference either way... I'd appreciate it
Nice tutorial. keep it up
I’ve always used a collimation cap and felt that one side of my image looks a bit soft. I tried a laser and it was super easy and I feel that my view is sharper edge to edge.
However, when I put the collimation cap back in after using the laser, I can no longer see all the primary mirror clips in the reflection. Does anyone have thoughts on this?
How do you collimate a scope if it does not have a center spot?
But i cant see clearly the hair cross of the chesire my eyepiece its maybe too short i bought the short version of the chesire ( cheapest) my eye can't focus the cross and what is the correct position to see trough the hole?.
Need to collimate a f4 newt? Get a catseye collimator kit.
Purfect collimation every time.
star collimation is still best as it'll account for things like camera sensor tilt.
Please do review on reflector telescope svbony sv 501p 70/400 please 🥺
Your videos weren't being recommended until I manually entered your channel name. Just a heads up
hmmmn...
When one promotes more content behind a paywall youtube doesn't promote the channel
I love your videos. It inspired me to begin astronomy and buy my first skywatcher dobsonian 200/1200
Sir I cant afford a good telescope yet I have a mini one could u find me a way for getting a big one
thank's
very nice, thanks my friend.
This is a random question but is there a way to computerize or atleast motorize a telescope without spending over €100 and if yes can you pls make a vid on it
What would you get for dso's(assuming you have a dslr and a good tracking mount)
A 6 inch f5 newt or a 6 inch rc ?
How often do you have to colimate the laser?
And I wonder how hard it would be to put a decent CMOS sensor in place of the secondary? Advantages: 1.brighter image due to no 2nd mirror loss, 2. No distortion from 2nd mirror, 3 no camera flex on the ota, 4. Potential passive sensor cooling as it could use the cooling of exposure to the night sky via heat sink or similar. Disadvantages: 1.possible heat distortion? 2. Wiring ribbon or equivalent needed for PSU & signal. 3. Collimation issues due to thermal expansion of sensor holder?
PS. Love the video as always :)
my laser has stayed collimated for about a year now.... good luck building the newt with no secondary. I have thought aboht it.
Very solid focuser you have, any models that would be good to retrofit to scopes with sticky wobbly focusers??!!
baader diamond steeltrack seems v good. Its hard to find any for small 6inch newts tho
I don’t understand when we need to collimate for the secondary mirror. I only make a simple collimation to the primary mirror using Polaris but I have never done anything to my primary mirror yet. So far I have no complaints but maybe I should?
if your star test is fine then leave it and be happy👍
@@Astrobiscuit that is good news for me. It means I will be checking this video later someday :)
This very thorough instructional video has put me off buying a Newtonian purely because I don't have the patience that you obviously need to keep the telescope functioning properly. Aren't there more compact versions (cassegrain?) that stay in line?
yep refractor is what you need.
How about primary mirror without adjust screew?
well then you have to hope its pointing straight... and if it is you're ok.
Great video but i have a question. People in the discord server are saying the laser is bad, should i listen and just buy the cheshire eyepiece or buy a collimation cap and laser collimator?
Hi Rory, I know this probably sounds like a dumb question, but how do you become a patreon member. I don't know what to click or where. I'd like to watch the rest of the video about star collimation. Thanks in advance
Unfortunately, many of the new Newtonians won't allow to adjust secondary tilt, because they put 3 pits into the 3 adjuster screw spots and many times the tilt is still incorrect. Lasers will also not fix tilt issues and won't show if there is a tilt with the secondary. The only way to find the tilt problem by looking at the shape of the primary mirror (reflected inside the secondary) with a Cheshire and recognizing the tilt, or using a special collimator camera. And to fix the tilt with those Newtonians, that won't allow tilt adjustment, the scope needs to be modified. There are some videos up in the youtube, someone doing just that, placing a large aluminum washer between the 3 adjuster screws and the secondary mirror's back and now the mirror can be rotated.
sorry but i think you (and loads of others) have got into a pickle. The only tilt i worry about is if the cameras sensor is tilted with respect to the primary. The secondary mirror is flat. It is optically inert. It just changes to angle the light travels from the primary.
or its possible im not understanding you right.... if so sorry
great
Wow im early, and this video is relevent, hi astrobiscuit
hi
man, now I want to get a telescope
Hiii .... Where are you I am waiting for your next video..
Great video! Is that a Televue case you have there? I wonder what marvelous piece of optics is in there 🤤
an old np101 with a bit if fungus on the lens😭
Hey astrobiscuit I have a newtonian but when I take pictures the middle is really dark circle like possibly the shadow of secondary mirror is that normal? Or something wrong BTW there are no light leaks
Look up vignette this can cause what you describe. BBC sky at night web site has a piece on it. ‘What is vignetting?’ was my search term. Hope you get it sorted.
I dont think my lil 4.5 eq Orion scope can be collimated
IM COLLUMATING MA LAZOR!
Hi, I have an honest question, I noticed Cassegrain scopes have a glass front with the secondary mirror, I was wondering how come Newtonians dont use the same glass front with their angled mirrors? seams like it would solve the diffraction spikes?
optically flat windows cost more than the scope itself but they are quite good i think and help with thermals as well as diffraction spikes....
@@Astrobiscuit Thank you, I appreciate your reply and time.
There are Schmidt-Newtonian scopes, but looks like they aren't in production any more:(
I loved your remark about how a single screw that holds the Cheshire eyepiece tends to hold it off axis. But doesn't that same screw hold your normal eyepieces, when you finally start viewing and after doing the collimation? Don't you want to reproduce exactly what your normal eyepieces see, from exactly the position they will be in? This is a great instructional video, I wish it was available when I did this on my 12" Newtonian years ago. So it was a refresher course, a delightful reproduction of what I went through at that time.
you're not wrong. I use a camera so the 1.25 adapter isnt in my imaginig train when i image.
AH..... this video would`ve been soo handy for me 25 years ago lol :D
me too😂
Is it about cause i had question about colimation on your discord server ?? If its, than thanks man for tutorial.. very appreciate.. thanks for your work..
well not just you... its something ive been strugglong with for years and niw i feel like i have a good understanding i thought I'd make the video.