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refractory
Pooh-Bah
Reged: 02/05/05
Posts: 1014
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Anyone know how flat optical comparator mirrors are? Good enough for large binoculars? Hi mag for telescopes when redirecting light to the objective? Thanks.
Jess Tauber
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Crab
super member
Reged: 02/23/05
Posts: 111
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Not very flat. If you do a search of this forum for "comparator" there are a couple of threads that talk about it. One example was a representation from Scherr-Tumico(my guess) that stated a spec of about 8 waves and the other was a test of a J & L unit with about .75 waves of astigmatism. Based on those limited examples binocular use if you are lucky would be about it.
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refractory
Pooh-Bah
Reged: 02/05/05
Posts: 1014
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OK thanks- what about as a chunk of glass to make a primary out of- do you know if good enough? Thanks again.
JT
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Celticmoon
journeyman
Reged: 07/10/08
Posts: 5
Loc: Nashua, NH
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I was cleaning my comparator and was thinking the same thing. Those mirrors are BIG. Too bad they're too thin and not really designed for high optical quality.
--------------------
Orion XT-8
ETX-80 AT-TC
DS-114
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Crab
super member
Reged: 02/23/05
Posts: 111
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If the glass passes a polarizer test for strain then it should work as a blank. That assumes some reasonable thickness of course. Glass type may be plate or pyrex or possbly something else. Mine is plate. I haven't analyzed it for strain yet.
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