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60MP Sony A7R IV
Sony FE 12-24mm f/2.8 GM

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Aperture Series @ 17mm: Big Tree at Bend in Alpine Creek

Shot using Sony A7R IV Camera1.

This aperture series at 17mm shows one of the most bizarre performances that I’ve ever seen from a lens: massive focus shift sufficient to change the image magnification (aperture breathing) along with a resoundingly different sharpness on the left side versus the right, which looks to be lens skew, as confirmed by the same results at 14mm and 21mm.

All signs point to a lens design having magnificent potential performance, but the left/right focusing skew seen here is unacceptable. The Sony A7R IV has gone in for a checkup to rule it out as the culprit, e.g., lens mount / sensor parallelism. UPDATE: see Analyzing Swing and Tilt of Sony A7R IV with Two Samples of Sony FE 12-24mm f/2.8 GM.

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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 full camera resolution, 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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Aperture series 2.8,4,6.3,9,11 available in full article

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