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Sony A7R II (42MP)
Zeiss Loxia 21mm f/2.8 Distagon

Notes on the Prototype Lens Used for Examples

Many pages in this review of the Loxia 21mm f/2.8 Distagon used a pre-production lens in which the lens coatings of the first front group had not yet been optimized (it is challenging to achieve uniform coatings on strongly curved lens elements).

Due to the strongly curved surfaces, the lens coatings of the first group of elements suffer from a spectral shift at the periphery, particularly the corners. Spectral transmission in the corners shifts noticeably to cyan in this pre-production lens.

Example (pre-production lens)

Observe that the corner areas have a cyan cast.

Production lenses have improved coatings, and will not show this effect.

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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.

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

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f8 @ 3.2 sec, ISO 100; 2015-10-01 18:48:27
Sony A7R II + Zeiss Loxia 21mm f/2.8 Distagon

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