Somewhere, starting from f2.8, there is a sharp degradation of the image, after 2.8 a smooth increase in quality, up to 5.6, It folds - unfolds, plus the lens protects. With its pros: Small, mirrorless, through an adapter), at 50 1.4 after 2 years of use it is like new, does not creak, Cons: At 1.4-1.8 it is very soft, HA for bright objects, even in the center of the frame: Info/i7/555a8c5ca16f757d03d20fb47f485f12/4-56-809/24298346/50_1_4 1.4G wide open is much sharper.
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