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General Photography
Low Light & Night
cropped sensor and exposure time
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<blockquote data-quote="WayneF" data-source="post: 547351" data-attributes="member: 12496"><p>For FX, I vote for the 400 rule. Stationary 14 mm FX at longer than about 20 seconds will show stars as slightly elongated blobs. I think 25 seconds is objectionable</p><p></p><p>HOWEVER, this does also depend on the degree of viewing enlargement. I am speaking of 100% views, but tiny resamples to fit the monitor screen are very much more forgiving (the opposite of enlargement).</p><p></p><p>Just saying, longer focal length is an enlargement. </p><p>And DX requires 150% enlargement compared to FX.</p><p>And any viewing magnification to view it on a larger screen is certainly more enlargement. </p><p>Any enlargement lets us see blur better.</p></blockquote><p></p>
[QUOTE="WayneF, post: 547351, member: 12496"] For FX, I vote for the 400 rule. Stationary 14 mm FX at longer than about 20 seconds will show stars as slightly elongated blobs. I think 25 seconds is objectionable HOWEVER, this does also depend on the degree of viewing enlargement. I am speaking of 100% views, but tiny resamples to fit the monitor screen are very much more forgiving (the opposite of enlargement). Just saying, longer focal length is an enlargement. And DX requires 150% enlargement compared to FX. And any viewing magnification to view it on a larger screen is certainly more enlargement. Any enlargement lets us see blur better. [/QUOTE]
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General Photography
Low Light & Night
cropped sensor and exposure time
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