Olympus M.Zuiko Digital ED 8-25 mm f/4 PRO
10. Autofocus
We also didn't have any problems with the accuracy of the mechanism – both in studio and outside we enjoyed 100% of accuracy as the lens practically didn't miss at all.
Photos below show that the autofocus didn't have any distinct front or back focus tendencies either. An image we got at 18 mm does feature a slight DOF shift toward greater distances but the proper object remains sharp all the same. Mind you that photo was taken at the most difficult combination, meaning the maximum relative aperture and the minimum focusing distance. Perhaps a part of that shift is connected to a specific field curvature which, in such complex constructions, is almost never an ordinary sphere segment.
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Olympus E-M5 II, 18 mm, f/4.0 |
Olympus E-M5 II, 25 mm, f/4.0 |