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Old 16-06-2013, 06:34 PM
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Merlin66 (Ken)
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Merlin66 is offline
 
Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,927
Comes down to the limited market...and bang per buck.
Easier to get a prism or two out of India/ China than a couple (or few) 1/10 wave coated front surface mirrors and support systems to align them....
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