EXCERPT page containing first few paragraphs. 2017-12-16 14:34:22
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MTF is very consistent across the frame and into the corners wide open at f/1.4 with peak performance to the short frame edge, rolling off gently from there to the edges and corners. The lens appears not to have been optimized for peak central sharpness at f/1.4, but for consistent sharpness across the frame free of any abrupt changes, and minimization of aberrations. Certainly this approach will be well-loved by video shooters.
Stopping down to f/4 brings world-class performance that sets a standard that lenses can match, with extremely high contrast for fine details as well as for coarse and medium structures. See the two rangefinder lens MTF charts that follow for context of this statement.
There is a mild dip in the mid zones which is surely a small field curvature, but the performance here is exceptionally even across the field for a 35mm f/1.4 lens.
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