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Old 10-05-2017, 09:14 AM
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sil (Steve)
Not even a speck of dust

sil is offline
Join Date: Jun 2012
Location: Canberra
Posts: 1,402
can you try stopping down the aperture? if you're taking long tracked exposures, just crop. But I take hundreds of short untracked exposures and stopping down eg f2.8 to f4 or f5.6 gives more consistent star shape. Plus I stack and with field rotation the worst get cropped out anyway.
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