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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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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.

  • Make better images by learning how to get the best results right away. For example, the best way to set up your Sony camera.
  • 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.
  • Jaw-dropping image quality found nowhere else utilizing Retina-grade images up to 28 megapixels filling up to 5K display, plus large crops.
  • 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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Variants SonyA7s 12MP, SonyA7 24MP, SonyA7R 36MP available in full article

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