Back Focal Distance & Your Telescope Image Train for Astrophotography (Not Funny)

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  • เผยแพร่เมื่อ 28 ส.ค. 2024
  • Turns out you guys want me to drop astrophotography knowledge instead of memes and jokes so here is a super sexy video about telescope back focal distance and image trains and go in a bit deeper about why your backyard astrophotography might suck, somewhat. Pretty exciting stuff. Don't peak too early.
    Thanks to the sponsor BINTEL!
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ความคิดเห็น • 180

  • @DylanODonnell
    @DylanODonnell  5 ปีที่แล้ว +51

    4 people are partially blind.

    • @dgodiex
      @dgodiex 5 ปีที่แล้ว +5

      4 people eyeballed their reducers holding them up to the Sun.

    • @MrKillerRichie
      @MrKillerRichie 5 ปีที่แล้ว +4

      Or two tried it twice.

    • @maxdemian6312
      @maxdemian6312 3 ปีที่แล้ว +1

      They burned their pathetic eyeballs

    • @PeterMaddison2483
      @PeterMaddison2483 ปีที่แล้ว

      And completley stoopid

  • @iansharp1171
    @iansharp1171 5 ปีที่แล้ว +29

    Nice! I've come to think that astrophotography is basically complicated plumbing!

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +3

      Haha perfect analogy 👌🏼

    • @jamesneagle1330
      @jamesneagle1330 5 ปีที่แล้ว +1

      I'm a plumber's kid. Can confirm.

    • @ppi57
      @ppi57 5 ปีที่แล้ว +1

      I'm a plumber... can reconfirm ;)

    • @LAshotts
      @LAshotts 5 ปีที่แล้ว +1

      Ian Sharp pluming with gold plated pipe 💰

    • @UNSCPILOT
      @UNSCPILOT 4 ปีที่แล้ว

      @@LAshotts and instead of water your directing light, which is even more finicky

  • @elmikol2443
    @elmikol2443 4 ปีที่แล้ว +5

    You cracked me up when you were going to point the reducer to the sun!! 😂

  • @davidmurren4644
    @davidmurren4644 5 ปีที่แล้ว +3

    Love that technical demo of finding the focal point by burning shit.

  • @pittlebelge
    @pittlebelge 4 ปีที่แล้ว

    If you want a simple way to sort out all those adapter, you can use some plastic tray box with compartment. One axis to order the largest side of an adapter, the other axis to order the small side. So for example, all the 1.25 inch to bigger diameters are on the same row. If you like to over-complicate things, you can group the compartments by 2x2 square of 4 with all the female and male combinations sorted. It's a nice way to sort out all sort of adapters, no matter the application.

  • @stevehanson5556
    @stevehanson5556 2 ปีที่แล้ว

    Great presentation just what I needed, I just purchased A QHY camera and I'm finding new information everyday thanks again.

  • @bloodstone2000
    @bloodstone2000 2 ปีที่แล้ว

    Hits like, for the big long thing on principle alone!

  • @EH-pm1ke
    @EH-pm1ke 2 ปีที่แล้ว

    This video makes my subwoofer go crazy at various points, like you have wind on the mic or something

  • @mjg2332
    @mjg2332 5 ปีที่แล้ว

    I just bought that same diagonal and Barlow last night.so how convenient that you made this because one of my questions was should I be using the diagonal with my DSLR.i have an 8 inch Celestron HD btw...thanks Dylan!

  • @stew_redman
    @stew_redman 5 ปีที่แล้ว

    Nice to see Dylan supporting local Aussie business. Not Bintel, I mean Glad bags! :D

  • @300BLKSUBSONIC
    @300BLKSUBSONIC 4 ปีที่แล้ว

    I offer my never ending friendship for the off axis guider. Oh and I love your vids

  • @Jcorban08
    @Jcorban08 5 ปีที่แล้ว

    Just subscribed....Hello from Oregon, USA. Enjoying your videos!

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Hey thanks for the sub John!

  • @thetelescopeyard9760
    @thetelescopeyard9760 4 ปีที่แล้ว

    Haven’t seen you do a full song you wrote in so long! Would be fun to hear some new stuff if you have been working on anything! And as always, great telescope vids 🔭

  • @Cbtree
    @Cbtree 5 ปีที่แล้ว

    You know when Dylan posts it's gonna be a good day

  • @OLD-AND-UGLEE
    @OLD-AND-UGLEE 5 ปีที่แล้ว

    Love the ending! Glad to see a new video from you. Been a while....
    Stay safe

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Thanks Mike :) I try to release every week.. apart from 2 recent weeks I've stuck to that schedule for months now. Which surprises even me!

  • @sHuRuLuNi
    @sHuRuLuNi 2 ปีที่แล้ว

    I'm a simple man. The Australian man told me to hit like for the big long thing, so I did.

  • @caminodesantiagojourney873
    @caminodesantiagojourney873 2 ปีที่แล้ว

    Awesome, thanks Dylan!

  • @timtimrawi
    @timtimrawi 5 ปีที่แล้ว

    One thing about the Celestron reducer is they measure from the end of top of the thread for 146mm... something I didn’t realize for months because I ... didn’t... RTFM. I hated the OAG at first the small FOV, the precious spacing in my image train it takes, but it’s so so much more accurate guiding than a guide scope.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Interesting! Guiding is so basic though it’s accuracy is dependant mostly on your polar alignment and flexure. If both of these things are ok there is no significant / noticeable improvement for OAG. Just another way.

    • @timtimrawi
      @timtimrawi 5 ปีที่แล้ว

      ​@@DylanODonnell I used a 60mm guide scope and noticed significant star elongation to learn about differential flexure. Basically when I'm using OAG I have perfect pretty round stars (when the gods are pleased) especially with long exposures, compared to slight elongations with guide scope 60mm. It's pretty much exactly identical to this guys post: www.saratogaskies.com/articles/gs-vs-oag/index.html . I don't have this problem with my refractor, just SCT.

  • @johnadastra1754
    @johnadastra1754 5 ปีที่แล้ว

    The Optec FR was great until I found there was not enough back focus to get an in-line focuser behind it. The late-to-market Celestron 0.7x FR works great on my C925 Edge and allowed ample space for a Moonlite CHL focuser. Now I get unbelievable V-curves and super low HFR readings. But you are good to point out knowing your back focus is critical for adding other accessories later (helps to plan ahead)!

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Nice one John. I'm super happy with the 0.7x .. much better than the Lepus 6.3 third party one.

  • @MrFingolfin
    @MrFingolfin 3 ปีที่แล้ว +1

    Hi Dylan! I have re-watched this video trying to figure out the best guiding solution for my not as big and long as yours but not too bad C8 HD 😅 what are you using instead of off-axis guiding? 🙏🙏

  • @I_Spaced_Out
    @I_Spaced_Out 5 ปีที่แล้ว

    One more reason to avoid diagonals with astrophotography is that the mirror in them can shift, which can alter the placement of your target and change your focus.

  • @JimmyDaboul
    @JimmyDaboul 5 ปีที่แล้ว +3

    Looks like you need an adapter friend or a friend with adapters so you can trade adapter stories with... I wish I had adapters🥺

  • @Zero_Point_Energy1
    @Zero_Point_Energy1 5 ปีที่แล้ว +1

    I’d love to see a video about optimizing exposure times

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Yeh I've been thinking a lot about this lately. I sort of touch on this on my very old "what is stacking" video

  • @Thunder_Dome45
    @Thunder_Dome45 5 ปีที่แล้ว

    I just posted a while ago on cloudy nights and found out my image train with that celestron adapter 93633-A may not work well with the SCT and a DSLR if you are using the celestron focal reducer. I've been using it and getting star streaks on the outer areas of the image and good stars in the center. I'm going to test a new configuration this weekend to see if a shorter focal distance will improve on that. Thanks for the video, it came at a good time for me. While I can still get focus maybe the closer sensor to the telescope will get rid of some of the stars that seem to be stretched on the edges.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Good to know! Makes sense.. exactly what I'm talking about here.

  • @chucknance1290
    @chucknance1290 4 ปีที่แล้ว +1

    Hey Dylan , have you ever added an external focuser to a Celestron Edge HD ? Is that something I should do to improve focusing an 8 inch for imaging galaxies with a mono camera and LRGB ?

  • @dylanslater83
    @dylanslater83 5 ปีที่แล้ว +3

    I'll buy you a 6 pack of stone wood for the off axis guider

  • @christosdalamagas5017
    @christosdalamagas5017 3 ปีที่แล้ว

    I wouldn't have hit like if big long thing wasn't mentioned. Keep it going @Dylan O'Donnell

  • @DrKazAstro
    @DrKazAstro 2 ปีที่แล้ว

    Here here for Bintel

  • @trentinh
    @trentinh 5 ปีที่แล้ว +1

    Gotta love them big long things

  • @TheZ3roCool
    @TheZ3roCool 3 ปีที่แล้ว +2

    Corners of the hole :D :D

  • @sketch6995
    @sketch6995 3 ปีที่แล้ว

    So its the T adapter that screws to the back of the reducer?

  • @peterbresler1382
    @peterbresler1382 5 ปีที่แล้ว

    Thanks for another great video. Keep them coming!

  • @2headedsnail
    @2headedsnail 5 ปีที่แล้ว

    I can't believe neaf only gave you around 3k subscribers... Your videos are so good it should be 30k...

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Heh I think it was more Trevor than NEAF that bumped my subscribers that month. Would be nice to have more but I understand I'm servicing a pretty small niche! I'm amazed to have this many. :)

    • @stefanschneider3681
      @stefanschneider3681 3 ปีที่แล้ว

      @@DylanODonnell Is this a humble Dylan😳?! I knew you had that side within you, you just don‘t show it ever too often 😂

  • @matthewburniston2822
    @matthewburniston2822 5 ปีที่แล้ว

    Hey Dylan i ended up chatting with Don about my back focus issue with my 294mc pro and 6in newt he work it out to 40mm for me based on my set up looks like another clear night so tonight a big test

  • @LiquidtravelPhotography
    @LiquidtravelPhotography 4 ปีที่แล้ว

    Great video. I am very new to all of this and I am curious how you figure out the appropriate Back focus length for an Olympus OM-D E M-5 Mark II with a Celestron NexStar 8SE. I have found a t-ring adapter and a male/ female adapter and will be using a Celestron 6.3 reducer. I heard the trial and error method but wanted to see if there was a way to determine what it should be. You said to check the manufacturer but I could not find anything from Olympus.

  • @celestromel
    @celestromel 5 ปีที่แล้ว

    Good one Dylan!
    Much better than your last rubbish (joke)! You’re already very humorous without over-doing it!
    Mel (and why don’t you come to South Pacific Astronomical Star Parties?)

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Thanks Mel :) I'll be at QLD Astrofest!

  • @jasonnewton1998
    @jasonnewton1998 5 ปีที่แล้ว

    good advice on leaving an imaging train together, could mean needing duplicate parts in a collection but it can be worth it if it's just spacers or an adapter... also backfocus was confusing in the beginning side of the hobby , it's very good for people to see how exactly to take it into account. I have that OAG, it's really big (including big prism) but modular, I haven't had much time with it since I focus on hyperstar right now but I hoped guide stars weren't a problem with it. What FL is your guide scope operate at? What do you think about Optec/Innovations foresight ONAG / sharplock? Keep doing what you're doing.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Guide scope is 600mm focal length but I have a smaller one I use sometimes with the RASAs which makes sense... probably overkill to have more focal length in the guidescope than the main scope :) No idea about those other products . I've heard a little and sounds interesting but regular guiding works so well for me I don't see any need to guide from the back at all.

  • @JohnMcGFrance
    @JohnMcGFrance 5 ปีที่แล้ว

    I seem to spend half my life looking for adaptors I know I have but can’t find! What annoys me most though is the insane expense of these things. They are metal tubes with a thread. How can they cost so much? Love the vids. Clear skies.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Oh man. I spent like $50 + shipping for a 1mm spacer to make the RASA 8 work.

  • @nishantpatil61
    @nishantpatil61 3 ปีที่แล้ว

    help me here mate. Bintel Newtonian F4 or Celestron Rasa 8? I pretty much follow your imaging pattern. help me choose.

  • @LAshotts
    @LAshotts 5 ปีที่แล้ว

    Yet another great video Dylan. That tweet though 😂 also I’m getting coloured banding in my stacked/processed images. I have no filters in atm (purchasing triband or just LP next month) I’m using a modded Nikon do you think the coloured banding is LP or a local light leakage possibly.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      It’s typical for dSLrs if they are thin lines.. the best way to handle is both with darks and dithering. LP typically comes from an edge so it could be! Dunno I’d have to see. Use a dew shield to reduced LP hitting the side though.

    • @LAshotts
      @LAshotts 5 ปีที่แล้ว

      Dylan O'Donnell thanks for the advice I really appreciate it.

    • @LAshotts
      @LAshotts 5 ปีที่แล้ว

      Dylan O'Donnell hope you don’t mind I’ve tagged you in my image on instagram to show you what I’m talking about. If you have time that would be great. If you don’t have the time it’s not a problem 👍

  • @GoldSrc_
    @GoldSrc_ 5 ปีที่แล้ว

    Ah yes, the fine ancient art of hoarding things, be it adapters, cables or tools.
    Also, good tip for finding out the focal distance with the Sun, too bad you can only do that once with each eye xD.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Yeh.. people in the comments keep saying you can't do it. But you can! At least twice!

  • @digitalblasphemy1100
    @digitalblasphemy1100 ปีที่แล้ว

    I have a sort of weird question about reducers. I have a 10" LX200 f/6.3 and I also have a f/6.3 focal reducer. Does that make f4 or does it change at all?

  • @astronomylivestream
    @astronomylivestream 5 ปีที่แล้ว

    Yes those spacers... I bought two sets of spacers six each, of course there were duplicates. Then to come to find out I needed a 7mm spacer for the 11” RASA to get me to a 55mm back focus. Again another six spacers, the other five spacers being duplicates. Sooner or later I be able to set up a road side vendor selling my duplicate spacer. “Dave’s Back Focus Spacers... at 9.99” Here in the USA these spacers can be had on Amazon. Yes my ruler is is mm... can’t live without it! Now I’m the search for piggyback telescope rings... my head hurts. Going to give Dave a call at High Point Scientific and let him figure out the right set of rings that I need. In my findings High Point has the best selection of telescope rings and other stuff too. Not only that, they are very knowledgeable and friendly too!

  • @PeterMaddison2483
    @PeterMaddison2483 ปีที่แล้ว

    Something I'm confused about is, does the length of the image train differ if you add a barlow or a reducer or does it just stay the same?

  • @phcalama
    @phcalama 2 ปีที่แล้ว

    Great video which leads me to ask a newbie question. I have an AT72EDII refractor and I'm not currently using a focal reducer. My ASI533MC Pro imaging camera requires a 55mm backfocus. Where do I measure this from? Thanks

  • @avyukt0906
    @avyukt0906 2 ปีที่แล้ว

    Hey Dylan,lovely video mate.I am a newbie.My Question is w.r.t OAG.I have a EdgeHD8.I am confused about what should i do for autoguiding.If not OAG then what?

  • @nicvermeeren3011
    @nicvermeeren3011 5 ปีที่แล้ว

    Can you explain why you don't use manual or motorised focussers? Whats the difference with using a lot of spacer etc?

  • @johnnyfu7054
    @johnnyfu7054 2 ปีที่แล้ว

    Hello Dylan’s , still having focusing problem of my setup - Celestron 8SE , ZWOASI178 (mono). What kind of extension /adapter I need? Or should I keep my diagonal? Kindly advise. Thank you.

  • @mostafametwally1
    @mostafametwally1 4 ปีที่แล้ว

    Thanks Dylan I have the same telescope and set up. The ASI 1600 apparently needs to be 56 mm from the end of the of the 0.7 Celestron reducer. How does moving the focuser on the telescope come into the equation i.e if i move the mirror and get a good focus using a Bhatmov mask, does that mean i have reached the correct back focus? or is backfocus different from focusing the telescope?
    Thanks

  • @DennisStonenightsky
    @DennisStonenightsky 5 ปีที่แล้ว +1

    Another very useful video, thank you! Question: I have just the C9.25. Do you know if I can I use the 7x reducer on it? Or is that one just for the HD?

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +2

      Yeh the one I’m using is the ehd and took agggges to come out. Worth upgrading the scope for though it’s great.

    • @DennisStonenightsky
      @DennisStonenightsky 5 ปีที่แล้ว +1

      @@DylanODonnell Thank you for the quick reply. I am newly retired and married. I think my wife would kill me (well something anyway) if I upgraded now. But I will keep that in mind for the future. Thanks

  • @MichaelJohnson-bn5cw
    @MichaelJohnson-bn5cw 4 ปีที่แล้ว

    Hi Dylan, I'm a beginner with AP and am working on my planets first with a Barlow and ZWO 178MC camera. Can you give me details as to your planetary image train setup? Specifically what nose setup do you have? I have a 8VX

  • @apteryxastro
    @apteryxastro 5 ปีที่แล้ว

    Great vid, not enough memes and jokes though. ;)

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Haha I'll try harder next time.

  • @insalatacosmica
    @insalatacosmica 5 ปีที่แล้ว

    I love your country❤️
    but the best coffee is bornt in Italy (Naples)
    Thanks for sharing best astro videos ever.
    Saluti and clear skies from Italy

  • @chadmayfield6206
    @chadmayfield6206 5 ปีที่แล้ว

    Dylan, I absolutely love your videos and you've taught me a lot. I'm using a C11 but added a feather touch focuser to the image train. I'm struggling to achieve focus without coma. So my question is...where should I measure from for back focus since I'm not passing an optical surface, i.e. reducer? Also...I'm about to throw my zwo OAG down a canyon, so if you wanna pass me yours....lol

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Do you have an Edge HD C11 ? If you don't it might not have a flat field to be coma-free. The regular ones would need some sort of corrector I assume. Also having a filter backwards can cause coma too. Or if you camera chip is too big for your OTA image circle.

    • @chadmayfield6206
      @chadmayfield6206 5 ปีที่แล้ว

      @@DylanODonnell Thanks for the response. I have the non-edge C11, so I'll look into getting a corrector to see if that helps. I'm using ZWO LRGBHOS filters and followed their directions to make sure they're oriented properly. I see the same affect on all filters so hopefully I didn't install them all backwards. I'm also using an ASI 1600MM Pro, but I don't think the sensor is the culprit. Thanks again, and keep making those awesome videos!

  • @thiagoprado7540
    @thiagoprado7540 4 ปีที่แล้ว

    I have a question. If I use a bahtinov mask to find the focus in a star and after that use this focus on a planet, it's will work?

  • @CitizenSniiiips
    @CitizenSniiiips 5 ปีที่แล้ว

    Dylan this video is perfect timing for me. Hope you don't mind me picking your brain (again).
    I have just got a second hand QHY10 off ice in space. i did my research and it was from a long time/well known member who has a solid history of buying/selling so I'm almost certain my issues aren't related to getting ripped off.
    Tried using it for the first time last night and the images coming off the camera were garbage. If I put the exposure length anything past 5s it became a noisy noisy mess. It was difficult to see many stars in the frame which made focusing/platesolving etc difficult. I'm pretty certain I have the correct back focus - QHY10 has 20mm and my field flattener needs 55mm so I have 35mm of spacers. Annoyingly the spacers don't thread all the way into each other so it's more like 37mm giving me a total of 57mm. First question is, does having slightly more backfocus than needed result in my camera struggling to focus and giving me the crappy image? Or will it just result in a non flat field but still focus ok.
    Other than the backfocus there could be something wrong with my setup that could be causing the image quality issues but I'm not sure what. The QHY was running of AC with the ac/dc converter that comes with the camera, I use a stellarmate for acquisition which has never given me issues in the past with my dslr, everything was connected and downloading fine and my gain was set to 5, offset 132. I know you don't use your QHY much anymore but when you did use it did you have any issues like this? It's frustrating moving to a cooled CCD and having images that are entirely unusable. I'm still a noob but I know my stuff when it comes to imaging.
    Thanks for your help :)

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Ask the person you bought it off what values he/she used for Gain and Offset. Then try on big bright targets first and also make sure cooling is on and set low and that you are calibrating your lights with dark frames. They are essential for CCDs.

    • @CitizenSniiiips
      @CitizenSniiiips 5 ปีที่แล้ว

      @@DylanODonnell Thanks Dylan, I was worried initially I bought a lemon, but the seller has been super helpful and even offered a refund.
      But, I did some testing yesterday afternoon and did some flats, bias, darks and they all came out looking fine. The flats were a bit odd but I hadn't calibrated them as I was in a bit of a rush. The good news was I saw no obvious vignette or anything that makes me think there are issues with my optical train/spacing.
      So if the calibration frames come out ok I'm sure the camera is fine, just user error the other night. Hopefully it stays clear tonight and through the weekend for some proper testing. With all this clear weather we have had (finally) is there a project that you're currently working on?

  • @frankbraker
    @frankbraker 3 ปีที่แล้ว

    And we're all alive!

  • @RaysAstrophotography
    @RaysAstrophotography 5 ปีที่แล้ว

    Nice Video Dylan! All those spare parts are byproducts of Astrophotography!

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Heeh it's true. And I did see your deleted comment. :) I was using Bintel before I started working with them and there are maybe 6-7 main competitors in the space but only 50% are *actual* astronomy stores and Bintel is the one with the biggest range and reach (and service).

    • @RaysAstrophotography
      @RaysAstrophotography 5 ปีที่แล้ว

      @@DylanODonnell thanks!

    • @RaysAstrophotography
      @RaysAstrophotography 5 ปีที่แล้ว +1

      Have you used Televue Powermate? Does it change your backfocus?

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      I love the powermates :) Yes, you measure BFD from the *last* optic in the train. So whatever it's specified BFD is.. the powermate comes apart so is inserted differently for a star diagonal / eyepiece or without straight into the OTA image train.

    • @RaysAstrophotography
      @RaysAstrophotography 5 ปีที่แล้ว

      @@DylanODonnell thanks! I will send you a picture of my image train using Instagram. What I noticed is the length of Powermate can be ignored when measuring the whole back focus, similar to Celestron reducer. I need to confirm that.

  • @DonGoddardAllAboutPaint
    @DonGoddardAllAboutPaint 5 ปีที่แล้ว

    Perfect timing for this vid. I'm suffering right now because I'm trying to do DSO's and I don't have everything I need every time. I'm pretty sure Jeff Bezos is trying to get a restraining order against me since I'm stalking on Amazon all the time.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Haha the struggle is real.

  • @stephenrichards5386
    @stephenrichards5386 5 ปีที่แล้ว

    Thanks Dylan.

  • @prima946
    @prima946 4 ปีที่แล้ว

    Hi Dylan. Using the ASI 1600mm-cool on the RASA 11 with a filter drawer. Is it best to have the filter drawer right against the camera or have a spacer in between? Still new to this and I have been using it with the 11mm spacer between the camera and filter drawer and the 16.5mm spacer between the filter drawer and RASA mounting plate.

    • @DylanODonnell
      @DylanODonnell  4 ปีที่แล้ว +1

      You know I can't really remember and it's not setup right now but I would guess you want the filter as close to the camera chip as possible as the image circle / focus gets narrower towards the chip so you don't want to clip the edges of it on the filter circle and get vignetting.

    • @prima946
      @prima946 4 ปีที่แล้ว

      @@DylanODonnell Thanks...once weather permits I'll try with the drawer closer to the camera and see how the results turn out.

  • @ACEOFSPACE2000
    @ACEOFSPACE2000 5 ปีที่แล้ว

    Hi Dylan at 9:35 what are the two adapters between the visual back and the filter wheel.Does the one adapter thread onto the visual back.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      It's one of those drop-in 1.25" things so I've dropped it in like an eyepiece would then tightened the screws.

  • @dudleymeadows1739
    @dudleymeadows1739 2 ปีที่แล้ว

    Why do you place the spacer between the filter wheel and the camera?

    • @DylanODonnell
      @DylanODonnell  2 ปีที่แล้ว

      They are 2” filters and it’s still close enough / they are big enough / not to affect vignetting.

  • @bdiddymack
    @bdiddymack 5 ปีที่แล้ว

    Off topic, but did you ever find out more about taking darks with the asi1600. There doesn't seem to be consensus on it. Some people say use flat darks? I dunno I've just been doing regular darks and it seems to working okay

    • @paths1111
      @paths1111 5 ปีที่แล้ว

      Flat darks are dark frames matched to your flat frames, and used to calibrate the flats before construction of the master flat. This is preferred to bias frames with the ASI1600 (and some other CMOS cams) as the bias "floats" depending on the exposure length, so standard bias frames taken at shortest exposure often do not work well. Flat darks remove the bias signal from the flats, allowing you to use the (non-bias subtracted) dark frames remove the bias from the lights.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      I never bother with flats, I just keep the camera clean. Darks work great and are noticeably better than without even with the 1600mm

  • @KingLoopie1
    @KingLoopie1 ปีที่แล้ว

    Dylan discount... +143%...😜

  • @jamesdougan8789
    @jamesdougan8789 5 ปีที่แล้ว

    thanks dylan thanks high point scientific ....hay im greedy i would like to see more jokes and info... ya gotta have a laugh you learn better I M O ...... and i need all the help i can get lol thanks again dylan (hope uni is going great)
    cheers
    james D

  • @fazergazer
    @fazergazer 3 ปีที่แล้ว

    Kangaroos. Ya gots them too mate, forgot to mention the kangaroo.

  • @pauselongue1986
    @pauselongue1986 5 ปีที่แล้ว

    Ouf, I'm not the only one !

  • @jamestickle3070
    @jamestickle3070 5 ปีที่แล้ว

    One crazy thing I’ve seen is a guy using his 2” filter as a spacer. Hey, it has threads front and back, it should work right?

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Hehe yeh well.. most things in the image trains are technically glorified spacers!

  • @AshA-ww8hc
    @AshA-ww8hc ปีที่แล้ว

    Why don't they make just adjustable spacers in the back instead of having to buy a bunch of different sized ones and try to lego your way into getting good back focus?

  • @rckuhmann
    @rckuhmann 5 ปีที่แล้ว

    Hey D.O.! Whoa! I now have 11-scopes and 11-mounts at my location... Who doesn't have shelves FULL of widdle black gadgets? But there is a saving grace - a good reason to keep 'em all. (At least, it's a rule we practice here at 53115-1339 USA.) He (or she) who DIES with the most astronomy gear (AKA, kit), WINS. Since I am pushing age 70, may I have an "age handicap" please? (Like in golf?) :) lol
    P.S. I for one, like your meaningless memes and dying jokes... I have but ONE gripe about dying - I won't get to see what comes next! As a confirmed technophile, that's the worst ...albeit that I shall also miss, the green side of the grass.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Haha thanks brother. Good to hear someone of your vintage has the heart and soul to enjoy my levity and nihilism! Keep up the good work :)

  • @southernexposure123
    @southernexposure123 3 ปีที่แล้ว +1

    Thanks for the humorous, informative and useful video - even though it was meaningless . . . because I'm going to die. ((- ; {

  • @sreeshab4093
    @sreeshab4093 4 ปีที่แล้ว

    such good stuff. pls ensure audio quality is good. so much of echo and noise. all the knowledge, hardwork is disturbed and lost.

  • @MrHueJazz1
    @MrHueJazz1 5 ปีที่แล้ว

    Wouldn't a crayford focuser do the same thing as all those spacers?

    • @frl8031
      @frl8031 5 ปีที่แล้ว

      spacers are put behind a corrector, while the focuser is in front. This affects the image projected on the camera or eye

  • @thepacketnarc7634
    @thepacketnarc7634 5 ปีที่แล้ว

    Hey Dylan, did you sell your Celestron OAG ?

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Nope! Still here if you want to make me an offer.

  • @africanmate8036
    @africanmate8036 5 ปีที่แล้ว +1

    yes

  • @robsbackyardastrophotograp8885
    @robsbackyardastrophotograp8885 5 ปีที่แล้ว +1

    FIRST!!!!! ERMAHGERD!!!! Caught it in first 26 seconds!!!!
    Also great vid, Dylan! I needed a good source of into about this stuff lol.

  • @Thunder_Dome45
    @Thunder_Dome45 5 ปีที่แล้ว

    In the intro of all your videos, what is that red circle you are tracking a dot with? Is that an asteroid?

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Yeh I don’t go looking for them but they turn up in my image runs so I always check now :)

  • @stefanschneider3681
    @stefanschneider3681 3 ปีที่แล้ว

    How can you NOT leave a LIKE when at the end you shortly introduce simon and garfunkel? The video was as boring as the topic, so finishing it up like this is just not fair 😂😂😂 ! Thanks! I guess that IS the boring, strenuous, extremely unsexy part of amateur astrophotography 😡😱 ... But two days ago I got a two hour glimps at a clear sky after work, put my camera with a 50mm lens on a tripod, took lots of pictures of Plejades, the nebulas around „swan“ and OF COURSE some more pictures of „my“ andromeda, using the same darks, bias and flat frames for all three of them and was JUST LOVING IT. The two hours of freezing under the clear skies, then punishing my computer with all the pictures - and I was just again BLOWN AWAY of what can be made visiible with such a simple setup an a little help of all that „stacking and processing“- stuff! Sincerely from the rainy / snowy lake of constance, Stefan

  • @MattsAstrophotography
    @MattsAstrophotography 5 ปีที่แล้ว

    Haha thanks for rubbing it in that you have the best sky's.lol

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Wouldn’t be a star stuff video if I didn’t 😆

  • @Nottsboy24
    @Nottsboy24 5 ปีที่แล้ว

    Super ☺👍:)

  • @superIuminaI
    @superIuminaI 5 ปีที่แล้ว

    I just did this the other day : ) did some trial and error with my reducer, at 6 different spacings.... expose, remove spacer, expose, remove spacer, expose, etc., 6 times. All show significant coma. -_-;

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Check to see if you have a filter backwards.

  • @southernexposure123
    @southernexposure123 2 ปีที่แล้ว

    Hold it up to the Sun. That's why his eyes are so dark.

  • @YTMegiddo
    @YTMegiddo 5 ปีที่แล้ว +3

    It'd have been funny had you had a bit of a scream and cut to a shot with an eye patch, don't do that and gone on like nothing happened.

  • @garbageman9145
    @garbageman9145 5 ปีที่แล้ว

    4:17. Imstructions? What... it's like i dont even know u anymore.Also, can you do maybe talk to your sponser and do a beginner buil, intermittent build pro build, dream build ext ext lol thank. Im poor and jimmy rigging something lol it's not pretty but i got a focal length of 3,000mm f13, but build was about 300 bucks

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Good suggestion :) Yeh I said "thanks John" because when google failed - I just asked Bintel and he rubbed the *instructions* in my face. Pfff. Surely the BFD should be printed on *every* optic. #nobodyreadstheinstructions

  • @erikkorhonen
    @erikkorhonen 5 ปีที่แล้ว

    4 debbi downers again, geeze you cant win

  • @jwing6269
    @jwing6269 4 ปีที่แล้ว

    Still got that OAG?? Lol

  • @lstoian2121
    @lstoian2121 5 ปีที่แล้ว

    Hit like for "big long thing..." :-)))) you forgot "black"....

  • @heuben
    @heuben 5 ปีที่แล้ว

    I need to win lotto......

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Yeh I find it hard to keep up with the expense of the hobby sometimes! But there's a lot you can do with a little. Software and technique is just as important as gear. I know a lot of dudes with twice as much gear as me who can't make a photo.

    • @heuben
      @heuben 5 ปีที่แล้ว

      Dylan O'Donnell good point, plenty of those guys everywhere. I just need a go to that can hold the weight of a camera. I am sure I could work out some kind of counter balance but, we just have a celestron 90mm wifi, will have to look into the “clutch” on it, as it seems really “loose”

  • @nosensenononsense
    @nosensenononsense 4 ปีที่แล้ว

    Back focus..

  • @astroshlibber9654
    @astroshlibber9654 5 ปีที่แล้ว

    Yea..yea...well we've got rain and damp and clouds and no air conditioning and....and a hot AND a cold tap, who's laughing now eh

  • @davelu5671
    @davelu5671 5 ปีที่แล้ว

    Best Beer...?
    You've never tasted german Beer😅

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว

      Challenge accepted. Bring me german beer.

  • @yobb89
    @yobb89 5 ปีที่แล้ว

    yeah yeah!!!!!!!!. alot of crap!!!! me too me too!!!

  • @BrianH1313
    @BrianH1313 5 ปีที่แล้ว

    I bet you pay a nice shipping fee to Australia. Dylan, how are we to trust you if you keeping telling us to do something that is not the correct way ...

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Yeh shipping to Australia is ridiculous. And you shouldn't trust me. :)

  • @erikkorhonen
    @erikkorhonen 5 ปีที่แล้ว

    Lacks humour. 3 stars only.

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Erik Korhonen god dammit !

  • @mgmcd1
    @mgmcd1 5 ปีที่แล้ว

    🧐😂🤓

  • @gregorys6838
    @gregorys6838 4 ปีที่แล้ว

    Sorry Dylan, you video looks very childish. Why are you sticking half your face into the camera? Why am I watching you?

  • @galacticus9845
    @galacticus9845 5 ปีที่แล้ว

    Dylan these videos are becoming more and more loose in their content.
    It might be a joke to you and other experts interested in astro equipment but newbies need to be told to never ever hold lenses up to the sun and eyeball them.
    This coupled with your other supposedly "funny" vid on cleaning and I'm wondering whether to unsub you.

    • @CitizenSniiiips
      @CitizenSniiiips 5 ปีที่แล้ว

      really? No one should EVER need to be told not to hold up a piece of glass and look through it while facing the sun. That has nothing to do with astro and everything to do with common sense

    • @DylanODonnell
      @DylanODonnell  5 ปีที่แล้ว +1

      Thanks for the feedback! I'm probably a bit loose for you so I totally understand if you need to unsub. Thanks for sticking around for a while though!

  • @johnnyfu7054
    @johnnyfu7054 2 ปีที่แล้ว

    Hello Dylan’s , still having focusing problem of my setup - Celestron 8SE , ZWOASI178 (mono). What kind of extension /adapter I need? Or should I keep my diagonal? Kindly advise. Thank you.