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Photography Q&A
Auto ISO questions.
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<blockquote data-quote="Marturo" data-source="post: 738107" data-attributes="member: 48418"><p>Hello.</p><p></p><p> I tried to post 2 photos I took that illustrate the difference, however I can describe it.</p><p></p><p>Camera, Nikon D7100</p><p>Lens, Nikkor 35mm F1.2 AIS.</p><p></p><p>Auto ISO</p><p>Aperture Priority</p><p></p><p></p><p>Photo#2773</p><p>F16</p><p>SS 1/30</p><p>iso 320</p><p></p><p> Photo#2774</p><p>F16</p><p>SS 1/30</p><p>iso 140</p><p></p><p> I have the camera set to 100 iso & auto iso.</p><p>I shot about 26 shots using F4 & F16 the photos varied between 100 & 450 iso.</p><p></p><p> The shots with the lowest iso are darker.</p><p>It makes no sense how & why the iso jumps around.</p><p></p><p> Photo #2773 is light enough that very little PP is needed</p><p></p><p> Photo #2774 is just too dark</p><p>Number 2773 & 2774 are the same scene, taken a second later.</p><p></p><p> I need a little guidance as to where I can read/watch to understand Digital iso</p><p>& how it differs from Film iso.</p><p></p><p> Thanks for your help.</p><p> Mike</p></blockquote><p></p>
[QUOTE="Marturo, post: 738107, member: 48418"] Hello. I tried to post 2 photos I took that illustrate the difference, however I can describe it. Camera, Nikon D7100 Lens, Nikkor 35mm F1.2 AIS. Auto ISO Aperture Priority Photo#2773 F16 SS 1/30 iso 320 Photo#2774 F16 SS 1/30 iso 140 I have the camera set to 100 iso & auto iso. I shot about 26 shots using F4 & F16 the photos varied between 100 & 450 iso. The shots with the lowest iso are darker. It makes no sense how & why the iso jumps around. Photo #2773 is light enough that very little PP is needed Photo #2774 is just too dark Number 2773 & 2774 are the same scene, taken a second later. I need a little guidance as to where I can read/watch to understand Digital iso & how it differs from Film iso. Thanks for your help. Mike [/QUOTE]
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