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MTF for Sigma FE 14mm f/1.4 DG DN Art
Sigma provides MTF charts that are computed and without reference to any spectral weighting. To Sigma’s credit, both diffraction and geometrical MTF charts are provided... but this is a meaningless distinction for an f/1.4 or f/2 or even f/2.8 lens, since diffraction has no meaningful role to play at those apertures.
Sigma further confuses the situation by providing only wide-open MTF and only at 10 (coarse structure ) and 30 lp/mm (medium structures), which is woefully inadequate for modern sensors hitting 110 lp/mm. At the least 40 lp/mm would be appropriate.
The most serious issue with Sigma MTF charts and virtually every other lens vendor (excepting Zeiss) is fantasy MTF based on computer calculations, not measurements using a real physical lens (as does Zeiss). What you buy can never achieve what is claimed.
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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.
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Want a preview? Click on any page below to see an excerpt as well as extensive blog coverage, for example on Sony.
