How to make a small easy telescope
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- เผยแพร่เมื่อ 4 ธ.ค. 2009
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This is a tutorial on how to make a small refractor telescope using lenses. I show the basics of making the telescope and I also explain how to select the lenses and what types of lenses to use. I show you how to find the focal length of a lens. Lots more projects on my website: www.stormthecastle.com
Lots of telescope stuff on my other website: www.telescopenerd.com
You can see the tutorial with the lenses here:
telescopenerd.com/make-a-teles...
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can you see planets with this?
You are amazing, it's people like you that are blessings. I admire you so much, thank you for taking your time and making these wonderful as well as fantastic videos! God bless you!
This is a great video! Easy to understand and it kept me interested til the end!
Thanks so much I will try it! EXCITED!
@lavonminor Grats on making the telescope! Yes, it is an inverted image. Used for astronomy! You can correct this by changing one of the lenses to a double concave.
thanks for this! where would you suggest purchasing the lens online? It'd be so cool to try it with the plano concave and convex concave lenses.
Great video! Quick question though,
Are you able to make this if you have two of the exact same convex lenses? Or do they NEED to have different focal lengths?
Very well explained. Thanks. Want to try it myself.
Thanks for this tutorial!
I appreciate your effort in bringing this presentation.Nicely done.
Than you this help so much. Thanks for also making a clear to the point video!
thumbs up
Thanks for the tutorial!
Thanks, fun little project! I bought a telescope mirror with an eight inch diameter. Going to make a very big telescope. Will be a fun series of videos.
Yes, this telescope inverts the image, comes upside down. if you want a right side up image you have to use a double convex lens and a plano concave lens. Or a double concave lens. Hope that helps!
@begginersluck Thanks for viewing. Magnifying glasses can be tricky to use. You are going to have to experiment with them and use different tube lengths. And two lenses of the same diameter will be ok. About finding the lenses for this exact project. i have links to them through amazon on my telescope nerd website.
this goes write in my favourites :-)
i have a question at the end i didnt get it when you focus the light when its clear what you do next ?
thanks for your video but I want you to describe how can i measure the position of the focal point from the lens to determine the position of the pinhole or the reticle inside the rifle scope (I know that you mentioned it in the video but I didn't understand
and how does the thickness of the lens affect on the magnification ?
thanks
thanks for the vid. it helps me to make my project telescope easy.. :)
Great information.
Thank you
je vous remercie pour les cours sur l'electronique, car cela m'a permis de connaitre les specifités et le role de chaque composant' je vous encourage parceque dans le monde actuel on se doit de s'entraider, merci encore!
@415p2 I haven't tried it but the 30 cm fl lens should be good too. The 30 is the focal length.
O M F G THANK YOU SO MUCH! This is everything I need for my school project!
Hello sir, Your video is most helpful then any other video on you tube when it comes to home made telescopes.But i am a bit confused in choosing lenses. My questions are:
1- I have a Magnify lens size of a human palm, can i use it for my telescope?
2- Can we use both lenses of same focal length & diameter ?
3- Is Plano concave & Convex concave setup is more effective in magnification?
4- Can we use a very big magnify lens like one used by detectives in movies ?
The best part of your video is when you teach us about lenses at least now i know about concave,convex,double convex & Plano convex.
Thanx :)
Nicely done!
@withoutthefire Yes, I believe so. That sounds like the combination that Galileo used.
That's a gooooood explanation.
Thanks for showing how to find the distances of the lens.
this helped a lot in my project
@Icklumpus great comment. But, isn't that the focal length? and to use the thin lens formula to get the magnification and focal length you need both radii of the lenses. difficult to figure unless given to you. Great comment though.
@dollydongphuong lots of places. amazon, I have links on my website.
anways good going man...:] im damn sure that u took a lot of energy on explaining this
😮I really appreciate your video 👊🏾
it helped me a lot thanks to you
How about a video or some pictures of how this little homebuilt telescope operates?
I suggest putting a long slot in the side of the inner tube and fitting a bolt into it through the outer tube so that it won't fall out the other side
very very simple and coll staff !!
@nayyark23 NIce work and good improvising! The upside down is normal. doesnt matter when you are looking at the stars and moon. But some good improvising on your part!
@epicfantasy Jupiter also has rings, and is much closer than saturn, and much larger. And I thought it'd be awesome to see its rings, especially with a homemade toy. Anyway I watched your tutorial, and today I bought some lenses, one +1.5 dioptres, and one -5.5. will these do for a galilean telescope? very nice vid by the way!
Is their any research before i try this project?
Where can I get the primary and secondary mirrors for building a 8" reflector telescope?
Can you tell me exactly where did you get the telescope lenses?
Website or a store where you found it
tHANKS MAN...
IN FACT I WANT TO SEE THE MOON ,SO I WANTED TO PREPARE A TELESCOPE , I THINK U R VIDEO HELPS ME...
can u do this with 2 of the same lens?? im trying to do this for a school project and im wondering if that would work
The angular magnification can be calculated by dividing the focal length of the first lens with the focal length of the second lens, thus if you have two lenses of the same kind the magnification will be x1 (no magnification). So, nope.
Yes, you can but the focal length of objective lens should be greater than of eye piece.
@ignilc This is an excellent question and difficult to answer. You probably mean Saturn's Rings? Part of it depends on how clear your night sky is and how dark. But I am not really sure. Maybe, 25ish?
How did you managed to get the lens out of the magnifying glass holder? Pls answer me mann
@00lightbulb yes, I have the mirrors to make bigger telescopes. One mirror is 8 inches in diameter. Those will be fun projects. Going to do vids.
Can you tell me were exactly I can find the lenses. I tried looking everywhere like Walmart, Osh, Lowes, Target, Office Depot, & Micheals
can you make the telescope the right side up with double convex lenses?
would it work if i have a convex and a concave? both exactly the same size?
I like it 😊
I have exactly the same scissors like yours:D BTW good tutorial
@epicfantasy Would that change if the eye piece lens was a Concave and the other was a double Convex?
You can use a little gap that youcan create with your hand as a lense. Just tried it and it worked.
@xXUndeadViperXx On a dark night you can see the Orion nebula without a telescope! So, any power is good, binoculars are alos good!
Hello all
Sir I really liked your video. I am making a telescope for my school project. I am using a concave convex lens of diameter 49 mm and focal length of 1350mm and a Plano concave lens of 49mm and focal length of 152mm. Will be able to get 9x image? please reply and also tell me the requirements for 10x or 20x
with that length and a 25MM Eyepiece you get 54x Magnification, if your eyepiece is 49MM you get 27x Magnification( with 1350mm focal lenght)
@madebo1294 YEs, the sliding allows you to find the focus. Only way to see clearly.
possibly, but you can get bigger rolls. magnifyiing glasses come in different sizes too.
Thank you
that was so easy thanks for making this video
+Thornton Chavez n
will a plano conves eyepiece work with a double convex lens?
@MySerenity11 Nice work! Great way to stick with it! Enjoy your telescope.
May I know
1. Will the magnifying power of the lenses affect the magnification (higher power bigger the magnification)?
2. And for both lenses shall i have the same magnifying power or difference (both must be 2x, 4x etc.)?
1. focal length only matters
2. irrelevant
Where do you go to buy these magnifying lenses without the handle?
nice video! of course i don't need to make one cause i have the Skyliner 8 inch by skywatcher. But watching this video is very educational!
Awesome thank you!!Btw u sound like Peter griffin
Where would you get the glass that makes it zoom in.
@ElizabethGama31 amazon has them. Links are on my website too. You can also buy kits that have the tubes and lenses.
Can I use this for looking at the planets?
I'd say minimum magnification to see detail on planets is about >20x. But even with around 10x you can possibly see the moons of Jupiter.
thanks !
where did you find the lenses? I've been looking for lenses and all I can find are very small pocket lens or large hand lenses.
exectely wonderfull
where did you get lenses from ??
hi where did you buy your lenses ??
is it strong enough to watch moon's crater closely and somewhat more detailed..and is that a double convex lens or plano convex lens?
it's not strong at all, the best is 3rd example
Depends on the focal lengths for the lenses. Even low magnification is excellent as long as you're sticking to viewing the moon. Otherwise, a real telescope is a good investment.
@snowcrystal2510 Good job on the telescope. The eyepiece lens shoudl be about 50 cm away from the objective. We make a sliding tube telescope so you can just adjust that as you need it. With a 10x telescope you should see some fun stuff like craters on the moon and a coouple of plantets like jupiter and saturn.
that was awsome
have you ever observed some exoplanet transits maybe by doing photometry or something similar? oh i forgot to introduce myself I`m a 15 year old student from southtirol in the northern italy and i am in the astronomy team of the school and maybe we will have the opportunity to go to a congress about exoplanet transits next year but my english is not so good yet i hope that I will learn some astronomical-words until that moment. yours is my favorite youtube channel:)
hi i have a school project on ths
i want to know what focal lengths should be used ?
i have one convex lens of f=32 cm
(i checked like u taught in yr vid):)
i e to buy the other what focal length lens should i buy???
very nice
Hello Mr Epic Fantasy,one more my question,How to increase the power magnifier?My telescope magnifier now is about 5x,how to increase become 10 x? is the eyepiece lens have be made smaller? Thank you.
Thanks :)
Do you know if i can use something else other than glass lenses??
well the image will be inverted for closer objects but if u want to look at distance objects like moon and stars they appear the same even if inverted so it wont b an issue
Did a telescope always form a inverted image?
Will the image be inverted or straight????
epicfantasy where did you buy the lenses from?
pro tip, know an optician. They can hook you up with 2 dollar lenses
I bought the two short and long focal length lens (the links to which were on your website), and I followed the protocol just as you detailed in your video, putting the short focal lens (curved) as the eyepiece and the long focal lens (relatively flat) as the objective lens. However, once I finished, no matter how I looked through the eyepiece, I only saw blurry images. When I turned the telescope around and looked through the objective lens side, the image was clear, but it seemed that it made objects appear farther away and showed an up side down image.
What did I do wrong?
hmmm...email me. and if possible send me a picture of the telescope. You probably just need a longer or a shorter tube.
Did u know the problem with it?
Do you have any pages that i can buy the materials?
Wait so were do I get the lenses from? And if I made one, would I be able to see planets close up?
a little bit. Not a whole lot.
The length of the tube depends on the focal length of the lenses. The telescope has to be able to slide, so you can focus it
Hello Mr epicfantasy, u have use the convex lens so it will make a inverted image, so hw 2 solve the problem of inverted image through the telescope...
plzzzz tel me :-)
hi i have a tasco 7x35mm zip focus binocular and a regular lens from glasses...is there anyway i can build a telescope??please respond...thank you
what is the approximate magnification needed to be able to see jupiters rings?
i have to download this video .
Hello Mr epicfantasy,I use two lens double convex with 9 cm diameter,and the telescope made by PVC pipe about 90 cm length,is it right?
@TheGreenOpossum thanks for watching my vids! I have never done any photometry, yet :)
can the eyepiece lens have 0.5 focus length, if so what all can you see with a telescope with 40x magnification?can you see stars, planets, etc?
Hi how is it to look from this telescope? I mean how is the clarity etc? Can you see the moon clearly? Saturn? Or ISS ?
Up to Saturn
i want it with english subtitles
pls its very important
on amazon. Might want to try american science and surplus too.
Really enjoy your videos. Thanks. Question tho.. if you have a focal length of, say ten and and eye piece length of say two, for 5x mag, how do you know roughly how far apart they have to be? What's the math in that situation?
If you are using both convex lenses, the distance should be the sum of the two focal lengths.