What makes the difference on partially and fully visible moon?
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While I'm satisfied (despite the fringe) with shoots from a partially visible moon with a cheap 500 mm lens: 1/100 ISO 100 f/? I cannot understand why the image quality is extremely diminished when doing the same with an almost fully visible moon: 1/80 ISO 100 f/? I suppose that fully visible is much brighter and when I try to compensate the situation by changing the aperture these effect show up. Is there an obvious explanation or do I just mess up the focus every time? EDIT: I repeated the process with an APS-C instead of full-format camera, now one of the images looks better (showing more details): 1/250 ISO 100 (APS-C) I'm not sure whether the crop factor allows me to focus more accurate or this is due to the 50% magnification. At least it shows more details.
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