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Old 28-08-2014, 02:02 PM
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Joshua Bunn (Joshua)
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Joshua Bunn is offline
Join Date: Oct 2011
Location: Albany, Western Australia
Posts: 1,093
I would suggest focusing on the centre of the frame, then checking the corners - see what they look like. Then, move your focuser in (or out, depending on the curvature) so the corners are in focus and the centre out of focus. This will at least tell you if the collimation is good and if its really field curvature. what do you think?

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