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EXCERPT page containing first few paragraphs. 2022-05-22 03:43:37

Sony A7s

A7s vs A7 vs A7R: Relative Image Sizes

The Sony A7s is a 12-megapixel camera. It’s helpful to understand the relative size of the images it produces versus the 24-megapixel Sony A7 and 36-megapixel A7R.

Resolving power (line pairs at specified contrast, e.g., detail) is a linear concept, not one of area. So while 24 megapixels is twice as large an image as 12 megapixels, the resolving power difference is 1.41X, assuming a lens can deliver the necessary resolution at similar contrast (unlikely); this gets down to per-pixel quality.

The higher resolution cameras demand high grade lenses focused perfectly with no shutter vibration or other technical issue to degrade their resolution. Moreover, peak resolution for a higher resolution camera is restricted to a much more shallow depth of field, so that the resolving power benefits exist in a relatively narrow zone of the image: on 3D images, going slightly out of focus means that the higher resolution camera is not higher resolution. Shot discipline and excellent technique come to the fore.

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

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Variants SonyA7s 12MP, SonyA7 24MP, SonyA7R 36MP available in full article

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