I Built a $20 Telescope and Used it for Astrophotography

[@Napert]

$20 of lenses and cardboard mounted to $2000 specialized astrophotography camera might be just a little overkill imo

[@astrolibrarian]

I think that this was an excellent introduction to optics and a real scientific exploration of how the entire process works. Well done, Bray!

[@astrofalls]

Thanks Fred!

[@marxiewasalittlegirl]

I was waiting for the auto focus to get it right

[@aquss33]

"the auto focus"

[@kemgreene8525]

I have been making homemade telescopes for years", if you replace the lens with , say a eye piece from a pair of old binoculars and if you add a prism placing the eyepiece top of the prism, now you can slide the tube back and forth to focus the image you will also find the image will magnify right side up. The main pieces here are the eyepiece and prism. Nice video 2 thumbs up"!

[@bitchplease5724]

Hi! Can you please elaborate on the process on making your telescope and the materials needed.

[@retro331]

Yeah can you like make a video, describing the specifics. Please

[@silverXnoise]

Experimentation is sort of the point. Disassemble an old pair of binoculars, play with those components, search for information about how to identify the components, how they can be measured and profiled, what allows what kind of optical effects. Learn to enjoy the journey, learning is its own reward, because then you will never be without engaging and meaningful activities!

[@anthonycook6213]

Great, instructive introduction! If you take a note card, cut a neat, round 1-inch hole in it, and place the hole over the front of the front lens, you would probably greatly sharpen the visual image of the moon and reduce the chromatic aberration (fringe colors), just as the quality of an image from a cheap manual camera lens is improved by stopping down or increasing the f/stop. I have also made a fuzzy telescope from a pinhole and an eyepiece to illustrate how the magnification is directly proportional to the distance from the eyepiece divided by its distance from the pinhole, whatever you choose it to be.

[@abhilashabrahme4406]

I also built a 20$ refractor telescope (in indian currency. 20×80=1600rupees) except it provides me with 116x optical zoom and it is made from pvc pipes so its pretty durable + it has a focuser too + there is no chromatic abberation in this telescope that i built.

[@शशांक1]

Can you show the process. Maybe uploading a video would be nice. Thanks

[@cjmelendez]

Que marca son las lentes que compraste? Donde las consigo?

[@abhilashabrahme4406]

@xorpdnap4246 the focal length is 700mm and the focal length of the second lens ( eyepiece) depends. Like if i want more magnification for planets, i use a 6mm lens i.e. 700/6 = 116x optical zoom. And lets say i want low magnification for deep sky objects, then i would use a 25mm eyepiece i.e. 700/25 = 28x optical zoom. So basically the focal length of the main lens is constant while the focal length of eyepiece changes as per the object

[@abhilashabrahme4406]

@@शशांक1 i dont have a yt channel. Sorry

[@mdiqbal409]

I made a $5 one which have zero magnification

[@nemesis2767]

I wrote my previous comment before watching the full video ... now i have watched it full.... thank you sooo much for explaining this much about telescopes .. i couldn't find that in internet so i was disappointed.. but you saved me bro 😁

[@Adrift555]

Been loving the videos you've been uploading. Keep up the good work!

[@astrofalls]

Thanks, will do!

[@umfa9817]

I think this guy needs to make a $20 auto focus next, because holy shit.

[@chuckmaddison2924]

I made one a while ago using a postal tube. It worked. I'm tempted to do it again as I now have a 90 mm lens sitting in the cupboard. Used 50 on last.

[@notgartificial8591]

Chromatic abberation can be completely removed if you take many individual photos with filters of different wavelengths. For each wavelength, use a different focus so that every one converges. Later, you can stack these wavelengths to create your full image.

[@joelewandowski8232]

Very cool little project that should be taught in high school science or shop class.

[@astrofalls]

Agreed, would’ve loved to learn about this in physics 1, but sadly it’s only a physics 2 topic in high school in the us

[@joelewandowski8232]

@@astrofalls they taught us how to build diode radios in 8th grade shop class.

[@slgamerloku]

Hey what is the difference between eyepiece and a lens used telescopes

[@tuloko16]

That’s awesome that you are showing people these “low tech” solutions and options for Astronomy. Sadly our hobby is plagued by marketing and its turning people away. Everyone is under the impression that you need all this expensive equipment, when in reality you don’t. And even worse, people have the equipment, and have no idea of how it works. Don’t get me wrong, technology is great, and we are able to do things we could only dreamed of just a few years back. But when you are introducing people to the hobby, this technology can actually turn them away by making them think “they absolutely need ths to do astronomy”.

[@ashleypenn7845]

Perfect for our homeschool unit. Thanks for sharing.

[@colincox6361]

This is great, I've already got a telescope but I need to try this!

[@astrofalls]

It was definitely fun to do! And having some lenses to use for demonstration is nice to have

[@nemesis2767]

Bro i have been watching you for a few months .. and i liked your content really..... and i like this video too ... i would appreciate it if you make more diy videos like this ....... btw i had a question in my mind for a while.... I've seen many astrophotographers including you using mostly refractors or sct .... is there any advantage in using refractor over reflector ? ...

[@astrofalls]

Usually refractors are easier to use and travel with! Some reflectors are better for specific needs, especially when you need a lot of reach or speed

[@nemesis2767]

@@astrofalls oh .. thanks a lot bro

[@kaxtorplose]

DIY cardboard telescope - $20.00 Weighted tracker mount - $1000.00 SEEMS DOABLE!

[@adriantcullysover4640]

You kooked soo young. Vouching for your well-being, Diana. The whole world is.

[@panther105]

I'm just impressed you could hold your arms up for so long in front of the camera...!! This would be fun, educational project for kids in a classroom by the way.

[@zazugee]

i built one before, but it had shorter focal than this one and used my viewfinder's lens with it

[@wooddogg8]

That was entertaining!✌😎

[@astrofalls]

Thanks joe!

[@declanwk1]

thanks so much for taking the time to carefully explain this.

[@ReptilesGeniales]

I think that you took a photo with the water stamp “astrofalls”, does that mean that it is your picture? Is there any chance I can download the picture in a higher resolution? I really loved how it looked!!

[@aminzqrti7672]

Thanks for uploading the videos🔭🙏

[@astrofalls]

My pleasure!

[@farhad6365]

you wanted make the maths beginner friendly.... and we skipped that part to make it even friendly....🤣🤣

[@aquss33]

this explained more about telescopes than Feynman's lectures on physics, insane... and I watched this for the fun of it cuz I like cameras, not for studying for my exam

[@corncobjohnsonreal]

I like how hard he pronounces the T in duct tape, even though duck tape is made from material called duck and it's sticky so it's tape so it's duck tape and it's not made for ducts at all

[@mrthrowaway5414]

Ok kaneda

[@sggamingspider]

Focal lens and how much is the diameter🙏

[@rroge5]

would you see anything if you tightened up the apeture a little?

[@DrPoo62]

Can I use double convex and concave lenses?

[@Janu-e]

You should have added a minus lens to make the image clear ( long distance reading lens)

[@oberonpanopticon]

It seems like this is a lot more complicated due to the simple fact that our eyes have lenses of their own. I wonder if you could replace one of the lenses in the telescope with that of your eye… except the eye is effectively already an objective lens focusing onto a sensor… damn, as if the physics of light wasn’t complicated enough on its own

[@deltacx1059]

1:31 what he doesnt tell you is singles are trivial (which is in this video), doublets are trivial (because you can buy the optics as a set) but triplets are nearly impossible because its nearly impossible to find them as a set (i hqvnt thus far ) and there is no reasonably explained info on hiw to select the elements individually. I so far have only made a doublet.

[@Solarlight500]

So i see your video at tiktok and i love the Orion nebula

[@romanvoronov6623]

Your Eyepiece lens link seems to be wrong: its neither 50mm diameter, nor 100mm focal length (as you say in the video)

[@selamkedir5352]

WOWWWWW this was a brilliant idia i think this will work i love it❤❤❤❤❤❤❤❤❤❤

[@lapua9828]

I have a very rigid 3 inch cardboard tube, might try this just for fun

[@_aryan_astro_]

Nice sir! I am waiting for your discovery by the way happy new year belated 🔭❤️

[@astrofalls]

Thanks! Happy new year to you too

[@kellyoreilley3865]

I have a question and was wondering if anyone could help me. I’m trying to make one of these with my niece and have a 38mm diameter 50mm FL for the eyepiece lens and a 50mm diameter 200mm double convex for the front lens but I can’t see anything. Does my tube need to be a certain length? I switched to a 50mm diameter 200mm double concave eyepiece lens and was able to see the moon but it was blurry, nothing like what he had. Then put the 38mm eyepiece lens back in with a 500mm double convex front lens and got nothing. I’m lost and nowhere near smart enough to understand he was explaining lol.

[@AdityaRaj_6350]

A bit late here but yes the tube has to be a certain length that is (focal length of objective + focal length of eyepiece) but make sure to make the eyepiece bit slidable to be able to fine-tune the focus

[@JakesPixel4]

Lookin good keep going

[@dilishrajandilish]

Excellent Explanation

[@MrSaisreekar]

This was part of physics 2 curriculum in US and u fortunately, most students get stuck at physics 1 and never really got to learn about physics 2. 🤦🏻‍♂️

[@feffo.brudha]

how did u calculate the distance between the lenses?

[@satheeshs9197]

Sir.newspeper 500 meter reeding smoĺl letter which lens pls.500 tell me

[@lunacxy8293]

Impressive ❤

[@martingonzales1509]

So what if i use 6 lenses

[@Scrubiverse1411]

Is that a paper tube

[@thasu6890]

wow, Tak has a new competitor 😂

[@FREE_FIRE2P]

Anyone in may 2024?

[@Rohit.Bhardwaj.Sharma.]

I have made 2 telescope in my life 1 Refractor and 2nd Dobsonian. From both the telescope i can see planets and enjoy moon with my family. Even captured jupiter and satun by the same telescopea all home made.

[@mustafaturk9180]

Did you follow any tutorials ? If yes can you share ?

[@cjmelendez]

Puedes mostrarnos un manual donde explique como hacerlo? Como aprendiste a hacerlo?

[@AbhilashNoxBaruahnx1ee7]

You sir are criminally underrated.

[@andrewdale290]

Damn it, I was hoping I could buy two cheap magnifying glasses, each the same and built this. Welp shit, I don't know where to get two different style magnifying lens

[@nepaligamer2443]

Name of the lenses ?

[@K1assh]

Jeez, I was ready to demand this be deleted. After spending thousands on astro gear, you can't come up in here and do it for $20. But it was a good and fun experiment!

[@CreateVideo]

*_nice video_*

[@NJ_Galactic]

i think if you really think it though and spend about $100 bucks on the tube materials you may be able to get an okay thing for kids to practice with.

[@Drejcxxx]

For 20 bucks you can buy used one like 60mm

[@rizzleroodoo]

bravo

[@piqaintan6280]

Why my image upsidw down

[@__coconut__]

That's how it works , you need to build a reflector

[@GamerXPlayz]

​@@__coconut__ we can use a diagonal mirror

[@AstroRVe]

Don't underestimate I'm using 40$ Telescope. My quality is far better than 8 inch dobs

[@aquss33]

I was thinking of doing this, but then I remembered real life exists and I hate chromatic aberration.

[@lasserajala2921]

Now I only need to spend $10000 on other gear.

[@IOANCHRIST-GODSTEF]

1Lens+Obscure_Conditions+Phone_Camera!

[@joakimastro]

SpudScope(TM)

[@Darulacam]

1:30

[@RhynierDanielBalansay]

Any one in 2024😂

[@ClevererChain99]

Yes

[@wadermelone135]

Me

[@revathir7863]

Me

[@wenming_2007]

Me

[@caydobe]

Yah

[@pawanchouhan3971]

What?

[@dustingibson5153]

APOD

[@expedito_syp9455]

Eu sou o comentário Br que você procura 😃

[@rockmusicvideoreviewer896]

after watching how out of focus your video is a 2:22 onward, I don't think I can trust you to show me how to build a telescope.

[@SyedShahhussain-i8z]

Hello

[@1.4142]

That's worse than shooting without

[@pawanchouhan3971]

1600 rs

[@heavyjohnny]

That was cool. Jankie, but cool. LOL

[@nivedkrishna8212]

Telescope 😂 camera ☠️

[@savedbygodsgrace1622]

Just build a simple telescope. Way too much talking.

[@Georgeolddrones]

2025 👍🇬🇧