Questions tagged [telescope-making]
The telescope-making tag has no usage guidance.
16
questions
2
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1answer
87 views
Telescope showing high chromatic aberration
Hi i have made a telescope with 1100 mm focal length objective lense and 21mm plano convex as eyepiece. Both these lenses are not achromatic. But when is looked through it , the images were completely ...
8
votes
1answer
186 views
Why telescope mirror glass shipped as randomly broken chunks of a constant size in cardboard boxes?
The video MIRROR LAB: Preparing for Casting GMT's Mirror 6 shows the unpacking several hundred boxes full of broken glass from OHARA, packed in styrofoam.
The glass chunks are a fairly uniform size of ...
5
votes
1answer
181 views
Why are these telescope mirror makers not upside down? (Daniel K. Inouye Solar Telescope)
The new open access Solar Physics article The Daniel K. Inouye Solar Telescope – Observatory Overview is the first of several papers about the new state-of-the-art solar observatory. For more info see ...
0
votes
1answer
164 views
How to make a 65 cm lens with a 20 cm hole in it for a Hamiltonian telescope?
This answer to What (the heck) is a Hamiltonian telescope? Is this one? confirms that the telescope in the question linked there is indeed as described and that the first lens is a full 65 cm aperture ...
3
votes
1answer
268 views
How can I improve the Field of View of my home-made telescope?
I made my telescope, with two convex lens of focal length 1000mm and eyepiece (plano-convex) with 25mm focal length. But I can see only a very small field of view, with inverted image. Do I need to ...
5
votes
3answers
489 views
Can a material other than glass be used for making telescope mirrors?
Although I do know of a few instances where professional or observatory mirrors have been made by alternate materials, it was primarily for targeting specific nuances, like weight reduction and low ...
2
votes
1answer
372 views
Why is this telescope so short? How hard is it to make such a fast primary?
The recently discovered object C/2019 Q4 (Borisov) is in the news because it might have an eccentricity greater than one, which means it might be from outside the solar system, though not necessarily.
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2
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1answer
140 views
What's the origin of Clyde Tombaugh's 9-inch Newtonian telescope?
Astronomer Clyde Tombaugh is shown in a now-famous photograph at the age of 24 with his "homemade" 9-inch Newtonian telescope in this image also shown in Elva R. O'Hara's Clyde W. Tombaugh: ...
3
votes
1answer
111 views
Custom telescope
I am currently trying to make a Keplerian telescope from "scratch" with plano-convex lenses bought online.
I have found my objective and eyepiece lenses. I'm just not sure if they will suffice to ...
16
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5answers
1k views
Has anyone ever tried to make a simple telescope using ice?
I grew up with long cold winters, and saw a lot of remarkably transparent ice formed by refreezing meltwater, both in puddles and ponds, and in large icicles. I'd always thought about making optical ...
3
votes
2answers
207 views
Need help in creating telescope
I have 100cm F.L objective and 10cm F.L eyepiece 10cm in diameter and double convex both.
what are the planetary objects I can see with telescope made with these lenses.
I also have a double convex ...
8
votes
1answer
1k views
How is it ensured that a parabolic shape forms while polishing a telescope mirror?
I understand polishing the mirror with a successively finer abrasive can create a curvature, but how is it possible to obtain a uniform curve that forms a parabola while polishing by hand?
4
votes
2answers
215 views
Need advice on mirror-making for a home-made amateur reflector [closed]
For example, what would be some good references to read first? What sort of glass slab should I use? What size; diameter and thickness. Im a first-time builder trying to build one
4
votes
2answers
23k views
How to make a telescope for viewing planets, moon and DSOs using a convex lens of aperture 100 mm and focal length 200 mm and other lenses at home?
I wanted to make a telescope with DIY things lying around in home. I read up that the aperture was a very important aspect and thus bought a convex lens with 100mm aperture and 200mm focal length, to ...
4
votes
2answers
9k views
Equation to find distance between objective and eyepiece
I have a home made astronomical telescope with 100 cm objective lens and 5 cm eyepiece.when viewing an object in infinity the distance between eyepiece and objective is 105 cm. So how could I ...
6
votes
3answers
2k views
Astronomical telescope making
I am thinking about making a telescope. I have a 100cm focal length lens which I can use as objective lens in my telescope. So which is the best focal length I can use as eyepiece in my astronomical ...