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Sony NEX-7

Color Balance Varies By Aperture

The Sony NEX-7 sensor has one major drawback, at least when using “fast” lenses: the color balance shifts strongly from magenta to green as the lens is stopped down.

More precisely, if one white-balances for neutral at f/5.6, then the wider apertures f/4, f/2.8, f/2, f/1.4, f/1.1 become increasingly magenta, though most of the effect is gone by f/2.

The most severe effects are at faster (brighter) apertures up to f/2.8.

Note that under artificial light, this effect might not occur (I tested LED and fluorescent), so I suspect it is related to the spectral balance of the light source.

The effect seems to occur with the fast lenses I have tested, but since it affects mainly fast apertures up through f/2, it is mainly an issue with f/2 or faster lenses, and even f/2 lenses show less effect. My tests show that it affects both close-focus and infinity focus.

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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 1.1, 5.6 available in full article
Sony NEX-7 + Voigtlander Nokton 50mm f/1.1

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