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EXCERPT page containing first few paragraphs. 2019-06-16 12:26:18
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Sigma DN 30mm f/2.8

Examples: Sharpness at Distance

Olympus OM-D E-M5 with Sigma 30mm f/2.8.

Most of these examples were shot to assess fine detail rendition over the frame.

These examples shot using camera auto exposure, which degraded image quality (noise) by under-exposing with the “correct” exposure. The Olympus E-M5 often needs ETTR (see DAP) of +0.7 to +2.0 stop exposure compensation to reduce the noise levels seen here. These images could probably have taken +1.5 stops.

RAW conversion

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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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  • Optical quality analysis of field curvature, focus shift, sharpness, flare, distortion, and performance in the field.

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f/4.5 @ 1/1500 sec handheld, ISO 200
Olympus OM-D E-M5 + Sigma DN 30mm f/2.8

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