EXCERPT page containing first few paragraphs. 2019-02-23 22:17:11
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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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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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