Thread: APM 140mm APO doublet
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Old 07-07-2018, 03:58 PM
Wavytone
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Join Date: Jul 2008
Location: Killara, Sydney
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Having had both an APM 130mm f/7 triplet and a 102mm f/7 ED doublet with an FPL53 element, if I was after a refractor again I'd buy a slightly smaller triplet in preference to a slightly larger ED doublet.
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