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1 vote
1 answer
74 views

What was the first nebulae of the first class?

4 votes
1 answer
405 views

How to make a 65 cm lens with a 20 cm hole in it for a Hamiltonian telescope?

2 votes
1 answer
96 views

C8 Finder Rotates Freely

0 votes
0 answers
92 views

Largest Optical Telescope NOT at Higher Elevation

1 vote
0 answers
27 views

Published magnitude limits of surveys

2 votes
1 answer
247 views

Telescope selection for concrete uses

1 vote
1 answer
78 views

Why do we call radio images "maps"? Is it because it is not optical, so therefore not an "image", strictly speaking?

0 votes
0 answers
153 views

Do solar eclipse paper glasses need to list both the ISO and CE stamp to be compliant or is the ISO sufficient?

2 votes
3 answers
283 views

Will there be a difference in what can be seen with a 50mm telescope and a 70 or even 80 mm one?

1 vote
0 answers
68 views

About telescope load

6 votes
1 answer
255 views

First photographic image taken with telescopes to produce astronomically useful results? What telescope was used?

5 votes
2 answers
213 views

What are the technological advancements that made it possible for modern large telescopes to work with alt-az mounts instead of equatorial mounts?

1 vote
0 answers
56 views

With a non-motorized telescope, can 100 pictures of 0.5 seconds be realigned and merged to get the equivalent of a 50-second long exposure shot?

6 votes
1 answer
450 views

What were the specifics of the photos taken by Sir Arthur Eddington during the Eddington expedition that supported Einstein's Theory

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