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General Photography
Low Light & Night
cropped sensor and exposure time
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<blockquote data-quote="MartinCornwall" data-source="post: 547346" data-attributes="member: 12701"><p>There are also the 400 rule for crop sensors where you divide 400 / 18 giving 22 secs. Or the 600 rule for full frame 600 / 18 giving 33 seconds. So your 500 rule with 18 seconds should have no trailing. If you see what looks like trailing in the corners only and also the stars looking a bit stretched out ( a like a bat) then this is not trailing but coma and is an issue with the lens.</p></blockquote><p></p>
[QUOTE="MartinCornwall, post: 547346, member: 12701"] There are also the 400 rule for crop sensors where you divide 400 / 18 giving 22 secs. Or the 600 rule for full frame 600 / 18 giving 33 seconds. So your 500 rule with 18 seconds should have no trailing. If you see what looks like trailing in the corners only and also the stars looking a bit stretched out ( a like a bat) then this is not trailing but coma and is an issue with the lens. [/QUOTE]
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General Photography
Low Light & Night
cropped sensor and exposure time
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