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John Carruthers
Skiprat
Reged: 02/02/07
Posts: 2267
Loc: Kent, UK
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Re: Thick mirrors
07/03/09 06:19 AM
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The classical 6:1 full thickness mirror does take longer to cool than the modern thinner float version but I feel they are far more versatile. They are much more forgiving when it comes to cell design and tend to keep their figure during temperature changes. Barring accident a mirror may last several lifetimes aquiring several different tubes and configurations as technology progresses but thin quartz modern mirrors are perhaps a step forward and they will stand the test of time I think.
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Jc
ATM 10" F6.1, 1/25th wave spec (max wavefront error +/- 1/12.6 in zone 4 of 6, sodium light )
6" F7 spec
127mm F9.4 Refractor
10 x 50 bin
ETX80 (finder)
Canon 20D
PST
DSI 1
and a curious mind
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