How to make a small easy telescope

[TheGreenOpossum]

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:)

[madebo1294]

When you slide the smaller tube in and out, doesn't that affect the focal length? Don't both focal length of the lenses have to meet?

[epicfantasy]

@madebo1294 YEs, the sliding allows you to find the focus. Only way to see clearly.

[withoutthefire]

will a double convex objective and a plano concave eyepiece work?

[epicfantasy]

@withoutthefire Yes, I believe so. That sounds like the combination that Galileo used.

[Icklumpus]

For your method of finding the focal length, doesn't that just find the distance from the lens to the image? Don't you take that length and put it into the thin lens equation?

[epicfantasy]

@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.

[Icklumpus]

@epicfantasy Now I see...you are using a light source from infinity, which makes the image form at the focus. :D Great video

[tamtam647]

i have the same siszzzorrzzzzz

[oel97]

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

[epicfantasy]

@oel97 probably not.

[sweetxsmile22]

am going to try it for my school project if it worked am gonna like :)

hehehehe

[jezerjojo]

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?

[DexterColdplay1fan]

O M F G THANK YOU SO MUCH! This is everything I need for my school project!

[lolzpwnz]

nearly finished it, its 135x :)

[epicfantasy]

@lolzpwnz wow! have fun.

[lolzpwnz]

@epicfantasy tyvm great vid!

[GeorgeChar95]

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!

[lolzpwnz]

im just finishing my telescope, its a big one lol

[snowcrystal2510]

umm... question(s)!

i've made the telescope according to ur instructions and i have small problem..... i have made the telescope of 10x magnification.....meaning the focal length of my eye piece is 5cm and objective is 50cm....so...while focusing the telescope, how far shuld the lense near my eye(eyepice) be from the objective lense,(in centimetres) in my case? and, how far can i see with a telescope with 10x magnification?can i be able to see stars or sumthing? plz answer asap!

K....thanx! ;)

[epicfantasy]

@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.

[snowcrystal2510]

@epicfantasy oooooohhh.......thanxx sooo much!!!! i'll go and try that right now!!!..... btw...my tube was about 45cms...no wonder!!! ok i'm trying that now!!!!i already used up two tubes...thanks so much..again..

ooopppssss...

i'm out of tissue rolls :) :) :) :D

[anilareya]

Can you tell me were exactly I can find the lenses. I tried looking everywhere like Walmart, Osh, Lowes, Target, Office Depot, & Micheals

[epicfantasy]

@anilareya amazon has them. I have links on my website.

[antolus22]

I have exactly the same scissors like yours:D BTW good tutorial

[chintan1500]

Can you tell me exactly where did you get the telescope lenses?

Website or a store where you found it

[epicfantasy]

@chintan1500 amazon, online. I have links on my website.

[pchukhnov]

Bravo!

[spitfiremanlizerd]

question if i wear glasses will it screw up my focal length at all? without glasses i can't tell if something is in focus or not.

[spitfiremanlizerd]

great vid need a place where i can get some lenses quick. do i just use plain mirrors or converging or diverging mirrors?

[KASHTutorials]

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?

[RevPro12]

when look through its upside down

[epicfantasy]

@xXUndeadViperXx On a dark night you can see the Orion nebula without a telescope! So, any power is good, binoculars are alos good!

[bitchkiller88]

nice , i have mad an 6.5x telescope from a Plano Concave (10mm, from an old camera)& Convex Concave (65mm from a magnifier glass)

[epicfantasy]

@bitchkiller88 nice little telescope. Grats!

[eminence18]

that was awsome

[scasey1960]

Nicely done!

[Maize52]

If I were to build a x6 or a x10 telescope, how magnified would it be? Would I be able to view planets in detail with it?

[epicfantasy]

@Maize52 no, you wouldn't be able to get any details. Just some of the colors.

[musicman1379]

not so small, is it?

[MySerenity11]

I had a lot of fun making this telescope for my pirate-loving friend at work. I bought 2 convex lenses of the same size online from Surplus Shed for a good price. I tried using wrapping paper tubes but mangled them trying to glue the lenses on without a coupler (the lenses were almost as big as the holes) and later found great wood-like cardboard tubes at a fabric store left over from their freight.

[MySerenity11]

@MySerenity11 I glued the lenses directly onto the tubes with hot glue which dried fast and used a different method for finding the tube lengths which I found online. It was explained like this. First convert your 2 different focal lengths to inches and then add them together. Then add 2 inches to that number and divide it in half. Take that number and add 1 inch for your objective tube and take the same number and subtract 1 inch for the eyepiece tube.

[MySerenity11]

@MySerenity11 For example Eyepiece FL= 2 inches. Objective FL= 12 inches. 12inches + 2inches = 14 inches.

14 inches+ 2inches = 16inches. 16inches / 2 = 8 inches. Objective tube = 8inches +1 inch = 9 inches. Eyepiece tube = 8 inches - 1 inch = 7 inches.

Thanks for posting this video. It was great! Oh yeah, and it IS true true that the image is upside down! :)

[epicfantasy]

@MySerenity11 wow! Thanks for this.

[epicfantasy]

@MySerenity11 Nice work! Great way to stick with it! Enjoy your telescope.

[Mr001cesar]

nice video but talk slower

[lavonminor]

I made the telescope and bought the lenses off line... My son loves it but everything is upside down. I used the same ones you had posted on your website. Is that how it is suppose to work? 

[epicfantasy]

@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.

[haleerosser]

mine dosent have volume

[2583654]

what can i see with a 6 X telescope.

In dark sky and clear sky. Like what will I be able to see and how clear will it be. And how zoo in would it be. Like would I be able to see mars, moon or jupier clearely...

[epicfantasy]

@2583654 not a whole lot but thats ok. Take the telescope out on a dark night and enjoy the night sky. Best thing with that telescope would be to take it out and look at the moon when it is only a sliver. You should be able to see some craters. Not during a full moon, just when moon is half or less. You can see mars, jupiter and saturn with just your eyes, the telescope will help some.

[ignilc]

what is the approximate magnification needed to be able to see jupiters rings?

[epicfantasy]

@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?

[ignilc]

@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!

[mabcool12]

@epicfantasy u mean maybe 25000000ish

[XxPosionxCupcakesXx]

i didnt know math was a part in this. AWW screw this im gonna find another way to make a teloscope

[acniloj]

what's the name of the knife again?

[nayyark23]

i tried making one with magnifying glasses but it is upside down

[epicfantasy]

@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!

[varsketisLT]

Well, aberrations... You can't see anything nice with singlet lenses. I suggest you getting two achromats, they work very fine and doesn't show so much fake colors. I'm just saying.

[Hollrobb]

This is great, i have a friend that hauls off junk for people and one day i seen that he had a old copie machine(the old large kind you see in offices) in his truck and he let me take it apart and i found a whole bunch of lenses in it, big ones and small ones , lots of types and powers, i'am going to get them out and see just what i have now that i have a use for them, thank you for sharing this video and the information,Rob

[18paro]

i dont have any of those things

[rajneeshru]

Will the image be inverted or straight????

[epicfantasy]

@rajneeshru inverted

[4tcuba]

hi where did you buy your lenses ??

[epicfantasy]

@4tcuba amazon

[4tcuba]

where did you get lenses from ??

[FintaruS]

thx :)

[2plus2is9]

very nice

[novelist10]

i watched this video, and twenty minutes later i had a small telescope. very cool vid.

[Films4You]

Great Instructions

[AugustRideSkateboard]

whot poht of yowk yous fwom? (what part of york your from) :)

[ElizabethGama31]

Do you know if i can use something else other than glass lenses??

[ElizabethGama31]

Were do I get the lenses???

[epicfantasy]

@ElizabethGama31 amazon has them. Links are on my website too. You can also buy kits that have the tubes and lenses.

[ElizabethGama31]

@epicfantasy Ok Thank you =]

[ElizabethGama31]

@epicfantasy Ok thank you!

[sania1027]

would it work if i have a convex and a concave? both exactly the same size?

[epicfantasy]

@sania1027 Yes, I believe it would.

[ApeShallNevaKillApe]

you sound like peter griffin, no offense

[jdiplaris]

can you make the telescope the right side up with double convex lenses?

[somethingcute100]

now that's what bi call some thing cool

[alexchooo123]

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 ?

[begginersluck]

This is the most useful video on how to build a telescope on the entire youtube site congrats :)

Oh and if you don't mind answering, I was wondering how you would make it with a magnifying glass. I can't seem to find the lenses anywhere.

Please respond asap as this project is due within the week!

Thank youu and seriously you should continue making "How to make..." videos. Good luck in your future endeavour :)

[epicfantasy]

@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.

[cyer5]

I appreciate your effort in bringing this presentation.Nicely done.

[heyitsmatt818]

hey does anyone know where i could get a convex concave lens?

[prabhatpalpal]

good work sir!

[cantujj]

Wow awesome concept!

[bradless04]

Wow terrible concept!

[robxyooj]

hey so does one lens have to be larger magnify than the other, or both have same magnification? Will a 30x 21mm loupe work as an eye piece? What can i use as the other lens?

[dilinski1]

so the sum would look like 360mm/-60mm = -6

[dilinski1]

does this telescope come out upside down? because i need this right way up for an astronomy project. thank you ^^

[epicfantasy]

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!

[dilinski1]

but you went on about the magnification and the concave lenses have - numbers on their focal distances so you end up with a minus magnification?

[1rohangrover1]

When you said here you can use a double concave, do you mean the eyepiece or the objective can be a double concave?

Very cool telescope and really easy.

[epicfantasy]

The eyepiece

[1rohangrover1]

Cool, thanks. I'm building telescopes with all of the recommended lens combinations here: science project. Your website was really useful too.

[zozo71zozo71]

very very simple and coll staff !!

[zozo71zozo71]

cool

[CodeRedCardinal]

make spartan armour next.

[LEESSKK]

This is really cool Will, I'd like to see that telescope one!

[Sxkcils]

Because his pulling it in and out?

Ohhh, you are the one who think sex is funny... Youre never gonna get laid..

[Aresftfun]

@sxkcilis>it was a joke of a joke. man, people are so serious these days. How do you know I havent gotten laid? (; In society, there are a couple things that are disliked. Sex jokes are one of them. Im making fun of sex jokes in that comment.

[Al3xUnReaL]

@Sxkcils totally agreed, really immature from him

[userpyromaster]

lol! i see.

[Aresftfun]

why did someone mark tuba as spam? oh well, cool vid.

[tubaplayer01]

very nice, 5 stars

[epicfantasy]

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.