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The *shortest* Cassegrain

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#1 Suk Lee

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Posted 24 February 2004 - 04:49 PM

"It's full of stars..."

So, I just read about this application of the Cassegrain design, and this pops up on AstroMart:

http://www.astromart....asp?cid=251829

Suk

#2 bierbelly

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Posted 24 February 2004 - 05:12 PM

Interesting, I had no idea that a telescope could be used as a microscope.

BTW, since it's a classic Cassegrain, it doesn't really belong in the CAT forum.

#3 Suk Lee

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Posted 24 February 2004 - 07:11 PM

Uh, no, it's not a telescope used as a microscope, it's a microscope objective based on the Cassegrain optical design.

#4 Guest_**DONOTDELETE**_*

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Posted 25 February 2004 - 01:34 AM

The 8mm (?) secondary mirror is so cute!

What do they mean by "dual (or more) wavelength applications"? Simultaneous UV, IR and visible use?

#5 wilash

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Posted 25 February 2004 - 02:23 AM

I wonder how long it takes to cool down? :roflmao:

The optical tolerances must be amazing. You wouldn't think the design would have any benefits over a lens system. Because of the object distance would would think the central obstruction would be a bigger problem.

Those collimation screws must be teeny weeny! :tonofbricks:

#6 wilash

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Posted 25 February 2004 - 02:27 AM

I got it! The reduction of chromatic abberation could be significantly more than in a lens system and if it was designed to focus UV and IR, it would benefit in a sharper image. :foreheadslap: Mirrors, you got to love them.

#7 matt

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Posted 29 February 2004 - 02:25 PM

But what kind of FOV would you get? I've wondered at times about all-reflective eyepieces (not that I plan to start a revolution, btw)


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