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Any kind of focus tracking ("AI focus" and the like) requires the camera to refocus between shots, and focusing requires the lens to be fully open. Also, you can use your DoF test button with aperture set to something small (f/16..) to see how the image looks like when the diaphragm is closed, and you will observe that this is a lot dimmer than what you ...


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For an SLR, moving the aperture blades will be a lot less effort than moving the mirror. So I doubt that there is a universal answer independent of camera model.


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