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<p>[QUOTE=&quot;rmpsrpms, post: 3086138, member: 31773&quot;]Aperture Priority doesn&#039;t care about aperture linearity for manual lenses. Just set the aperture where you want it to get acceptable DOF, and the camera will evaluate actual exposure levels and set the exposure time (and ISO if left on Auto) to give proper exposure based on your metering settings.</p><p><br /></p><p>Edited to add: I think you may be right if the actual lens is chipped, since the aperture will still be active. My comment was based on using lenses with adapters, such that the aperture is fixed and not wide open during focusing.</p><p><br /></p><p>Second edit: it&#039;s almost certain that some level of exposure compensation is required for coins. The nonlinear aperture could be compensated using this method such that the desired exposure results. Typically coins are photographed at f/5.6, f/8, or possibly f/11, so EV values can be entered if the aperture is changed. This should not eliminate the use of non-AIS lenses with chips. It just requires an EV to be entered if the aperture is changed.[/QUOTE]</p><p><br /></p>

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