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127 APO North Group - Problems?
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21-05-2009, 10:15 PM
AlexN
Widefield wuss
Join Date: Mar 2008
Location: Caboolture, Australia
Posts: 6,994
Im fairly certain their 6" achro is a petzval, what with it being F/5 iirc, however the 152ED is marked as a triplet, not a quadruplet, as a petzval would be.
AlexN
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