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Zeiss Loxia 35mm f/2 Biogon
Zeiss Loxia 50mm f/2 Planar

Focusing Loxia

For the Sony A7 series cameras, configure a the C1 button to zoom in and stay there). By so doing, it is quick to zoom in and focus, then press the shutter release to exit, compose, shoot.

In the field, focusing at f/2.8 was determined to be ideal (but focus at f/2 if exposing at f/2). That’s because f/2 dispenses with some wide-open haze, increasing contrast and sharpness to nearly peak levels, which makes focusing a breeze.

Open-to-focus + close-to-shoot — Like its Zeiss ZM sibling, the Loxia lenses have mechanical aperture control: turning the aperture ring stops down the lens so that what you see is what you get, both for focusing and exposure. The aperture always stays where the ring says it is; the lens does not stay open at maximum aperture as with a DSLR lens or conventional mirrorless lens. The approach to focusing is thus as follows:

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Diglloyd Guide to Mirrorless is by yearly subscription. Subscribe now for about 25 cents a day ($90/year).
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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.

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

Two well used Zeiss lenses after extensive field use
Zeiss Loxia 35mm f/2 Biogon and Zeiss ZM 35mm f/2 Biogon

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