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F- stops for different lenses
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<blockquote data-quote="bandit993" data-source="post: 668716" data-attributes="member: 16598"><p>I have a kind of stupid question concerning F- stops in different lenses. If you use the same F- stop with 2 different lenses will you get different ISO values. Take for example a $16,000 Nikon 600mm F/4 lens set at F8 and a $1250 Sigma 150-600mm C (@600mm) at F8. Will the camera need different amounts of light or set the ISO at the same level? Using auto ISO that is. I have the Sigma and usually shoot it at F8 for sharpness and back ground values. Just wondered if the Nikon lens would be any "brighter" at F8 than the Sigma? Hope I am not wasting peoples time too much with some of my questions. Thanks</p></blockquote><p></p>
[QUOTE="bandit993, post: 668716, member: 16598"] I have a kind of stupid question concerning F- stops in different lenses. If you use the same F- stop with 2 different lenses will you get different ISO values. Take for example a $16,000 Nikon 600mm F/4 lens set at F8 and a $1250 Sigma 150-600mm C (@600mm) at F8. Will the camera need different amounts of light or set the ISO at the same level? Using auto ISO that is. I have the Sigma and usually shoot it at F8 for sharpness and back ground values. Just wondered if the Nikon lens would be any "brighter" at F8 than the Sigma? Hope I am not wasting peoples time too much with some of my questions. Thanks [/QUOTE]
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