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Sony A7R

Sony A7R: Vignetting and Lens Comp

The move to a full-frame sensor increases vignetting and color shading effects, even with lenses designed for the camera (some brands silently correct both and more, e.g., Fujifilm).

Leica has addressed color shading and vignetting for years with Leica M digital cameras by using coded lenses to indicate to the camera how to compensate, but taking it one step further in allowing the user to manually designate lens, in order to support uncoded lenses. A neat trick which applies applying compensation to non-Leica lenses. Sony has no such support.

Lens Comp

A working assumption (based on NEX-7) had been that Lens Comp settings had no effect on raw ARW images with Sony cameras, but this has changed with the Sony A7R, at last for Shading Comp.

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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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  • Save money by choosing the right lens for your needs the first time, particularly with the numerous lenses available for Sony.
  • Make better images, a sort of “cheat sheet” saving yourself months or years of ad-hoc learning—best practices and how-to and processing parameters are discussed and shown.
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  • Real world examples with insights found nowhere else. Make sharper images just by understanding lens behavior you won’t read about elsewhere.
  • 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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