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Forum: Photographic Technique
10-01-2018, 06:14 AM
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Lets not forget that we work with photography equipment, not some kind of high precision astronomical or scientific devices. So, yes, there is some variation and they are normal and expected. Although there can be focus shift when closing the aperture, in practice this doesn't matter for photography. Because the increase in DOF will more than cancel any slight shift the focus may have (unless the lens is defective, which is totally different matter). So, basically, just enter the adjustment for the widest aperture and don't overthink or overwork it, unless doing it as some kind of scientific experiment. It should work good enough for more than 99% of photography needs.
If you need extremely accurate focusing, the best is still to work in manual focus. No matter how far you go in defining precise adjustment, autofocus will still be less accurate for fundamental reasons.
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