EXCERPT page containing first few paragraphs. 2024-04-16 11:09:56
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Olympus E-M1 Backfocus with 12-40mm f/2.8 PRO
Out in the field, your author made it a point to make a variety of comparisons and aperture series with the 12-40mm f/2.8 PRO zoom (and other lenses).
Sometimes the EM1 delivered pinpoint autofocus, e.g. with very high contrast sunlit targets), and at other times there was severe backfocus, or in other cases, front-focus error.
The results with the 12-40mm and 12-35mm SHG zooms were dismal: frequent and substantial autofocus errors rendering much hard work useless to the goal (comparisons and aperture series). Yet manual focus has its own trickiness, with f/2.8 on MFT having the depth of field of f/5.6 on full frame—not a lot to go on to distinguish nuances.
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