EXCERPT page containing first few paragraphs. 2021-12-05 15:16:17
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This aperture series shows the performance of the Olympus Zuiko 75mm f/1.8 ED on an exterior planar scene, but with some foreground and background to provide additional insight.
- How far to stop down for peak sharpness, optimal aperture.
- When diffraction starts to degrade image quality.
- Overall lens performance across the frame.
Test scene, lenses, etc
I shot this scene 5 or 6 times using both autofocus and manual focus, confirming that the Olympus OM-D E-M5 autofocus would deliver slightly variable focus each time, better with direct sun, notably worse when the contrast dropped (a cloud obscured the sun).
It is thus a certainty that this is the best possible result from the 75/1.8.
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Diglloyd Guide to Mirrorless offers comprehensive integrated coverage of most APS-C and full frame mirrorless cameras and lenses.
Special emphasis is placed on Sony full-frame, including Sony lenses and the high performance Zeiss Batis and Zeiss Loxia lenses plus Rokinon/Samyang and others. Fujifilm X, Olympus and Panasonic M4/3, Sigma dp Merrill and dp/sd Quattro are also covered in depth. Years in the making, it offers a wealth of material for choosing and using a mirrorless camera.
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- Aperture series from wide open through stopped down, showing the full range of lens performance and bokeh.
- Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.
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