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dp2 Quattro Optical Distortion
Distortion is of the barrel type (bowing outwards) and fairly typical of a normal lens, though surprisingly high for an f/2.8 design (which is f/4 in format equivalent terms to full frame cameras).
The barrel type distortion is generally easy to correct in most raw converters, but since most raw converters do not support Sigma X3F files and Sigma Photo Pro does not offer distortion correction, it’s a bit of a conundrum if one wants to correct it.
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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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