12 votes

Has anyone ever tried to make a simple telescope using ice?

I'm not sure it counts as "simple" but there is the ice cube neutrino observatory whose detector consists of a cubic kilometer of very clear ice a mile or so down in the antarctic icecap.
Steve Linton's user avatar
  • 10.3k
7 votes
Accepted

Why telescope mirror glass shipped as randomly broken chunks of a constant size in cardboard boxes?

The material used for the mirror is indeed E6 Borosilicate manufactured by Ohara corporation as pointed out by @notovny. The fabrication process of a borosilicate glass honeycomb mirror has remained ...
Wilhelmroentgen's user avatar
6 votes

How is it ensured that a parabolic shape forms while polishing a telescope mirror?

How is it ensured that a parabolic shape forms while polishing a telescope mirror? While a spherical shape is fairly easy to abtain, a parabolic shape definitely isn't! It's a combination of special ...
Florin Andrei's user avatar
5 votes

Can a material other than glass be used for making telescope mirrors?

Front-surface glass mirrors weren't developed until the 1850s. Before that, the most common material was speculum metal, a high-tin bronze. Notable examples include Isaac Newton's 1668 prototype and ...
Mike G's user avatar
  • 18.7k
5 votes

Has anyone ever tried to make a simple telescope using ice?

I know this string is old, but...for what its worth. I made a simple lens out of cling film filled with water. I just laid some cling film over a cake tin ring and poured water into it. You can adjust ...
ianbo's user avatar
  • 51
4 votes

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?

You would be better off using lens 5 and 3. Though don't expect much, a simple single lens for the objective and for the eyepiece will give a lot of chromatic aberration (false colour). Refracting ...
James Screech's user avatar
4 votes

Need advice on mirror-making for a home-made amateur reflector

Here's what I've learned from making telescope mirrors. Start with a mirror that's of a reasonable size and curvature. It is definitely possible to begin with a 12" f/5 mirror, but the problem is you ...
Florin Andrei's user avatar
4 votes

Need advice on mirror-making for a home-made amateur reflector

I second the comment about Texereau -- originally written in French; it's the best, bar none. You won't need anything else. Remember the old adage that is quicker to make a 4" mirror and then an 8" ...
Mick's user avatar
  • 1,546
4 votes
Accepted

What's the origin of Clyde Tombaugh's 9-inch Newtonian telescope?

In the first chapter of Out of the Darkness: The Planet Pluto, Tombaugh gives a colorful, personal account of his youth in Illinois and Kansas, including five telescopes: his uncle's uncorrected 3-...
Mike G's user avatar
  • 18.7k
4 votes
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Has anyone ever tried to make a simple telescope using ice?

This is a coincidence, but it seems that the photographer Mathieu Stern has been thinking about making and using an ice lens for photography for years. The video linked below was just recently ...
uhoh's user avatar
  • 31.1k
4 votes
Accepted

Can a material other than glass be used for making telescope mirrors?

Good, fast , cheap -- pick any two. And here you need to add things like "machinable," "stable," "nontoxic." So, there are plenty of metal mirrors but they are much more prone to deformation ...
Carl Witthoft's user avatar
3 votes
Accepted

Telescope showing high chromatic aberration

Is this because I have not used achromatic lens? An easy way to check for the effects of chromatic aberration will be to look at a narrow wavelength source. These days that's easy because the spread ...
uhoh's user avatar
  • 31.1k
3 votes

How can I improve the Field of View of my home-made telescope?

There basically are three main properties which influence what you see with your telescope: The aperture defines how much light you get, thus how sensitive your setup will get. The bigger, the more ...
planetmaker's user avatar
  • 19.4k
3 votes

Can a material other than glass be used for making telescope mirrors?

Can a material other than glass be used for making telescope mirrors? Yes! From this answer to Why are telescope mirrors made of glass? They are not always made of glass. In situations where mass ...
uhoh's user avatar
  • 31.1k
3 votes
Accepted

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 generally agree with the answer above, but have a couple more insights which might help you if you decide to proceed with trying to make your own scope... The lens pairs that James mentioned (crown ...
nflemming2004's user avatar
3 votes
Accepted

Need help in creating telescope

If F is the focal length of the objective, and f the focal length of the ocular, then the magnification of the instrument is: M = F / f So you'll get 10x with the first combination. This is enough ...
Florin Andrei's user avatar
2 votes

Need help in creating telescope

If you use the 100cm FL convex lens as an objective and the 20cm FL concave lens as an eyepiece, the telescope will have only 5x magnification but otherwise be similar to the one Galileo used to ...
Mike G's user avatar
  • 18.7k
2 votes
Accepted

Why is this telescope so short? How hard is it to make such a fast primary?

I don't have enough room in the comments for this, so I'm writing here, although it's probably not a true answer since I know nothing about that particular telescope. Anyway, if you look at many SCT ...
Florin Andrei's user avatar
2 votes

Has anyone ever tried to make a simple telescope using ice?

Has anyone ever tried to make a simple telescope using ice? I have done some research and not found any evidence of an attempt to build one. Another poster has added information on a neutrino ...
Alphecca's user avatar
  • 696
1 vote

Why are these telescope mirror makers not upside down? (Daniel K. Inouye Solar Telescope)

I think this seems legit. Why not?
Hagen von Eitzen's user avatar
1 vote
Accepted

Custom telescope

There are a lot of potential problems here. First, double-convex lenses are not necessarily the best so far as chromatic distortion, or, more important, astigmatism & coma go. Most likely plano-...
Carl Witthoft's user avatar

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