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GlennLeDrew
professor emeritus
Reged: 06/18/08
Posts: 577
Loc: Ottawa, Ontario, Canada
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Re: Orion's new 5 element Barlows...
08/06/08 11:44 PM
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Reminds me of the ever-increasing blade count in Gillette razors. Currently up to 5 there, too! Where will it end?!? 
But regarding light loss. With good coatings, it'll be negligible. After all, look at, say, a Fuji bino. It's got something like 12-14 air-to-glass surfaces, *and* a 4-inch thick prism train to boot, and they claim what, 96% light throughput?
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
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