EXCERPT page containing first few paragraphs. 2019-02-17 11:03:10
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MTF wide open at f/2.4 is already outstanding and as good as most lenses achieve stopped down. The falloff to the outer zones is mild field curvature, but actual MTF where in focus even in extreme corners remains nearly as high as at center; see the crops in the various aperture series.
Stopped down to f/5.6, MTF rises to world-class levels in mid and outer zones with minimal astigmatism (superb). This low level of astigmatism is achieved in only the very best 24/25mm lenses.
Curiously, the MTF in the center declines slightly at f/5.6, suggesting a mild focus shift. But given the large gains over the rest of the frame, this is surely part of the “balancing act” needed for such high performance in such a compact optic.
Context: the far more expensive Leica 24mm f/1.4 Summilux-M ASPH cannot even begin to compete with this performance—its peak MTF is lower than the Loxia 25/2.4 and its field curvature and astigmatism are excessive that it is hopeless for any kind of scenario in which one desires even sharpness across the field.
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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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- 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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