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Photography Q&A
understanding DOF
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<blockquote data-quote="Stoshowicz" data-source="post: 491313" data-attributes="member: 31397"><p>Oh I just came across a thing that said something about Canon calculating in a bellows factor so that the aperture is open to the level of Illumination one expects without the falloff in light due to that bellows factor with changing focus distance ,, meaning the aperture may not be at the diameter you think it is, in the lens itself.So For Nikons the exposure works out as if the Fstop was correct , and for Canon the aperture size works out to be technically correct for calculating exposures of large format and macro ,,, Or so It read that way. If you havent heard of this , well,., it was the first time I did either.</p><p></p><p></p><p><a href="http://www.largeformatphotography.info/bellows-factor.html" target="_blank">Large Format Photography: Bellows extension exposure compensation</a></p></blockquote><p></p>
[QUOTE="Stoshowicz, post: 491313, member: 31397"] Oh I just came across a thing that said something about Canon calculating in a bellows factor so that the aperture is open to the level of Illumination one expects without the falloff in light due to that bellows factor with changing focus distance ,, meaning the aperture may not be at the diameter you think it is, in the lens itself.So For Nikons the exposure works out as if the Fstop was correct , and for Canon the aperture size works out to be technically correct for calculating exposures of large format and macro ,,, Or so It read that way. If you havent heard of this , well,., it was the first time I did either. [URL="http://www.largeformatphotography.info/bellows-factor.html"]Large Format Photography: Bellows extension exposure compensation[/URL] [/QUOTE]
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