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Best Barlow for Planetary Imaging?
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02-05-2017, 04:32 PM
Merlin66
(Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
Posts: 8,909
Graham,
To get into the "sweet spot" of f25 to f30 (rule of thumb f ratio=x5 the camera pixel size) the x5PM would work well.
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