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Other Photography Equipment
Back calculating exposure using variable ND filters for long exposure times
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<blockquote data-quote="Eye-level" data-source="post: 98065" data-attributes="member: 6548"><p>Personally I have never tried it but my reference book prescribes an exposure of 1/2 second at f11 to begin to blur people and an exposure of 2 seconds at f22 to eliminate them (base normal exposure @ 1/30 f2.8) . 15 to 20 minutes seems like an awful long time to me - I am thinking maybe several minutes in poor light/night time???</p></blockquote><p></p>
[QUOTE="Eye-level, post: 98065, member: 6548"] Personally I have never tried it but my reference book prescribes an exposure of 1/2 second at f11 to begin to blur people and an exposure of 2 seconds at f22 to eliminate them (base normal exposure @ 1/30 f2.8) . 15 to 20 minutes seems like an awful long time to me - I am thinking maybe several minutes in poor light/night time??? [/QUOTE]
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Back calculating exposure using variable ND filters for long exposure times
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