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Re: [ATM] Suggestions for a "focus screen" for an optical testbench.

To: "Thomas Janstrom" <tomjan@ozemail.com.au>
Subject: Re: [ATM] Suggestions for a "focus screen" for an optical testbench.
From: "Vladimir Galogaza" <vladimir.galogaza@zg.htnet.hr>
Date: Sun, 23 Oct 2005 13:36:05 +0200
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Thomas,

How do you intend to decide on exact focus by examining
focused image by an eyepiece?

You should have either well collimated input beam
or optical bench to measure source and image positions
and calculate the focal length.
Why not avoid screen by making paraxial KE test on star.

Regards
Vladimir.




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- [ATM] John Dobson in the Smithsonian
  - From: "Don Clement" <clement.focuser@verizon.net>
- Re: [ATM] Suggestions for a "focus screen" for an optical testbench.
  - From: "Thomas Janstrom" <tomjan@ozemail.com.au>

References:
- [ATM] Suggestions for a "focus screen" for an optical test bench.
  - From: "Thomas Janstrom" <tomjan@ozemail.com.au>

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