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Sony NEX-7

Sony 24mm ƒ/1.8 Sonnar Aperture Series (Focus Shift)

This page examines the optical performance of the Sony E-mount 24mm f/1.8 Sonnar for NEX, with a particular attention to focus shift and field curvature.

For background details, see the Sony 24mm f/1.8 Sonnar lens discussion.

Focusing

Because of the bright lighting, focusing at f/1.8 or f/2 was not an option for this scene (too bright to focus on the area I wanted), even with the camera set to 1/4000 second. So I focused at 1/4000 at f/2.8, which yielded an image I could discern properly.

I shot a series using manual (11.7X zoom) focus, as well as an autofocus series— both at f/2.8, which means that focus was achieved stopped down to f/2.8, a critical point in the discussion that follows, given the apparent strong focus shift. The manual focus and autofocus series were almost identical, with the MF series showing slightly superior results at f/2.8, so that MF series is used on this page.

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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.
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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.

Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Sony.

Aperture series 1.8, 2, 2.8, 4, 5.6, 8, 11, 16 available in full article
Sony NEX-7 + Sony 24mm f/1.8 Sonnar

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