Telescope lens is a bit of an interchangeable term.

Some people refer to eyepieces as lenses. Let's take a look to see which you are looking for.

Lens or eyepiece?

Maybe you have a telescope like this and you need the thing that you look through (shown by the red arrow) . Traditionally that is called an "eyepiece". Ok! I have more information about them, how easily figure out what you need, and where to get them. Right Here: A Look at Telescope Eyepieces.

Same thing applies for this type of telescope where you look into the side of it. Traditionally that's an eyepiece.

Okay! You are still here! So, I am thinking that something like this is what you are looking for. The big glass lens on the end of a telescope.

Great!

Now I have a question. Are you looking to make a small telescope and you need a lens?

If yes then I can help.

You actually need two lenses to make a telescope.

You need that large one at the front. But you also need a smaller one at the other end. This smaller one is what you look into.

So you have a couple of choices here. You can do the math and figure out what you need, if your needs are very specific.

Or if you just want to make a small telescope like this one and you need the lenses then here you go! I have a pair right here. These are the exact lenses that I use to make this little telescope.

Note that you need to buy one of each of these. Each picture shows three lenses but you purchase one lens.

LENS DBL CONVEX 3.75CM DIAM 30CM FL (This is the objective or long focal length lens)

LENS DBL CONVEX 3.75CM DIAM 5CM FL (This is the lens I used for the eypiece, the short Focal length lens)

And if you need a tutorial on how to make the telescope I have it for you right here: How to Make a small and fun telescope (We make that exact telescope in the pictures above)

You also have the option of buying a kit with everything included. Kind of a nice option.

Artec Handmade Telescope Kit

Build your own Kepler telescope with Artec's Build Your Own Telescope Kit! This kit allows your students and children to build a Kepler telescope and learn how a Kepler telescope works. The Build Your Own Telescope Kit will magnify 30x. This kit will make excellent school projects! Observe the stars with your very own hand-built telescope by Artec! The kit has a convex and a concave lens. The image viewed will be upside down.

Build Your Own Telescope Kit contents: Objective lens Eyepiece lens Paper body tube (8) Wood finder connecting part Wood base parts (3) Wing nut Hexagon head bolt School glue Artec's line of science educational supplies for classrooms are a great source for STEM (Science, Technology, Engineering, and Mathematics) education and curriculum development for elementary, middle, and high schools.

Cardboard Galilean Style Telescope Building Kit

This kit can be supplied assembled or in pieces for young hands to construct as a fun learning tool. The kit comes with: (2) telescoping tubes, (1) positive lens, (1) negative lens, (2) end caps, and an instruction page.

The telescope assembles in about five minutes and is ready to use. There is no glue needed, kit can be dissembled and reassembled. The magnification is approximately 3X, and the view is right side up. Closed, the telescope has a length of 10.25", while fully extended it measures 15.25". The larger of the two tubes has an outside diameter of approximately 1.67", and the smaller is 1.44" in diameter.

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