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Ed Jones
Pooh-Bah
Reged: 04/06/04
Posts: 1415
Loc: Sin-sin-atti
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Re: flat mirror tests
07/02/09 09:41 PM
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Actually the reflectivity of glass is only 5 times dimmer. I've made a number of flats using this test and no it's not as nice as using a reference flat in air. However if you lack a reference flat I think it is easier than making 3 flats for the 3 flat method IMHO. With the right light source, collimating lens and set up it is a useful test and kind of cool. It's biggest drawback is finding the required collimating lens but then Dick used a mirror for his collimator.
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Ed Jones
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