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<blockquote data-quote="Stoshowicz" data-source="post: 368017" data-attributes="member: 31397">Yes sir I understand the reasoning, though I'm not finding it necessary to abide with its precaution. Because shutter motion duration is always of a minimum duration which is the same as&nbsp; syncspeed the distortions due to motion which would be seen at 1-250th of a sec are still there in axis of shutter closure. You just cant escape that diagonal distortion by- reducing the duration which individual pixels experience are being lit. The pixel in the upper left hand corner always is obscured at least 1-250th of a second before the pixel at the lowermost right corner. Unable to correct this other than by actually being very still,, one is largely just making the image darker , and so requiring higher iso or wider aperture. But yes I do understand why they use the formula they do. ( at least , this is how I'm thinking the whole thing works this way)&nbsp;( eyelight was using a reference guide number of 1-1000th of a sec which is four times faster than my syncspeed)If a person can use a tripod and avoid this precaution of 1.5-2x focal length, the expectation is based on an assumed amount of wobble that a human exhibits.</blockquote>

[QUOTE="Stoshowicz, post: 368017, member: 31397"] Yes sir I understand the reasoning, though I'm not finding it necessary to abide with its precaution. Because shutter motion duration is always of a minimum duration which is the same as syncspeed the distortions due to motion which would be seen at 1-250th of a sec are still there in axis of shutter closure. You just cant escape that diagonal distortion by- reducing the duration which individual pixels experience are being lit. The pixel in the upper left hand corner always is obscured at least 1-250th of a second before the pixel at the lowermost right corner. Unable to correct this other than by actually being very still,, one is largely just making the image darker , and so requiring higher iso or wider aperture. But yes I do understand why they use the formula they do. ( at least , this is how I'm thinking the whole thing works this way) ( eyelight was using a reference guide number of 1-1000th of a sec which is four times faster than my syncspeed) If a person can use a tripod and avoid this precaution of 1.5-2x focal length, the expectation is based on an assumed amount of wobble that a human exhibits. [/QUOTE]

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