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<blockquote data-quote="cameraf4" data-source="post: 22309" data-attributes="member: 5191"><p>I wonder if anyone else has experienced this. Before I "went digital", my travel lense was a Sigma 28-200mm Aspherical Macro that always gave beautiful Fujichromes. When I got my D700, I thought the images were always just a tad over-exposed. I recently got a Nikkor 28-200mmG and did a side-by-side test shoot. </p><p>At each comparable focal length, at the same aperture setting and shutter-speed (as per Nikon View NX2), the Sigma is consistantly 1/2 to 1 stop "lighter" even tho View NX says that the exposures were identical. </p><p>My thoughts are that the Sigma isn't closing-down to the proper F-stop that the D700 sets where, on film cameras where aperture was set via the lens, it did fine. Has anyone else noticed that maybe "third-party" lenses don't close down to the correct "shooting aperture" when the camera sets the F-stop?</p></blockquote><p></p>
[QUOTE="cameraf4, post: 22309, member: 5191"] I wonder if anyone else has experienced this. Before I "went digital", my travel lense was a Sigma 28-200mm Aspherical Macro that always gave beautiful Fujichromes. When I got my D700, I thought the images were always just a tad over-exposed. I recently got a Nikkor 28-200mmG and did a side-by-side test shoot. At each comparable focal length, at the same aperture setting and shutter-speed (as per Nikon View NX2), the Sigma is consistantly 1/2 to 1 stop "lighter" even tho View NX says that the exposures were identical. My thoughts are that the Sigma isn't closing-down to the proper F-stop that the D700 sets where, on film cameras where aperture was set via the lens, it did fine. Has anyone else noticed that maybe "third-party" lenses don't close down to the correct "shooting aperture" when the camera sets the F-stop? [/QUOTE]
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