http://www.mkgrip.com/english.php?m=product&a=product_view&tid=246&id=132
MTF50 of the Olympus 45/1.8 (green), Canon New FD 50/1.4 (blue), and Meike 50/2 (purple) in the center (solid) and corner/edge (dashed).
Reminds me of the Rokkor semi-pancake, but maybe a bit sharper.
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