Thread: ED Design?
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Old 29-01-2014, 12:02 PM
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Satchmo
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Join Date: Dec 2005
Location: Sydney
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Designs like this were published in S and T years ago- certainly a good idea for a large achro refractor. The bottom line is that its easier and cheaper from a manufacxturing and alignment viewpoint to use ED glass. There was a corrector available for a while to sort out the CA in the 6" F8 achros when they first hit the market .
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