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Mark Harry
Post Laureate
Reged: 09/05/05
Posts: 3121
Loc: Northeast
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Re: flat mirror tests
07/03/09 07:00 AM
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Why can't you specify a long distance between source and flat tested? it would minimise the effect, and negate the necessity of the lens altogether. Can't remember, but isn't it around a 20:1 ratio of flat diameter?
I still say it would be easier to shine a compact flourescent at the ceiling with a glare shield. It's 10 times better than a hanging light illuminating the flats as the reflection off your pan of water shows. The bands will be very evident.
Mark
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So many projects, so little time!
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