Nikon Nikkor AF-S 24 mm f/1.4G ED
10. Autofocus
The accuracy in general usages is not a problem but the credit should be given not to the autofocus itself but the parameters of the lens and a significant depth of field, connected to them. For example by f/2.8 it’s enough to set the distance scale at less than 7 metres to get a sharp image from less than 3.5 metres to infinity. When it comes to the lens’s accuracy in studio conditions it was incredibly difficult to get any numerical value here. The problems are connected to the focus shift, described earlier, and the significant level of spherical aberration.
The pictures below show these problems perfectly well. A shot taken at the maximum relative aperture proves that the lens, without any calibration, hits exactly where it should. On stopping down we see a significant back focus which, for the same distance, increases so quickly that near f/5.6 we are at the end of the micro-regulation available in the body.
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It is a problematic issue because it would be difficult to imagine changing the micro-regulation value on the camera menu level each time we decide to change the aperture.
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