Thread: Should I get a 5x Barlow for imaging?
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Old 18-05-2016, 03:49 AM
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Merlin66 (Ken)
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The rule of thumb for planetary/lunar/solar imaging is that the optimum focal ratio would be x5 the size of the camera pixel (In micron) I.e. For a 5 micron pixel camera, f25 would be the target.
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