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

To: tomjan@ozemail.com.au, atm@atmlist.net
Subject: Re: [ATM] Suggestions for a "focus screen" for an optical testbench.
From: Nils Olof Carlin <nilsolof.carlin@telia.com>
Date: Sun, 23 Oct 2005 13:11:03 +0200 (MEST)
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>>Just trying to find a suitable material to use as the screen that a 
lens
under test will focus onto, I'm thinking of using an eye piece to
examine the image formed to find the "exact focal length" at a given
frequency.

Thomas, 
why not a piece of glass, ground with fine grit on one side?

Nils Olof
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