At 75mm, central sharpness is very good all the way through from f/4 to f/22, and still good at f/32. Thus the inclusion of that smallest aperture may be vindicated. The edges are also very good from ...
Reviews / SMC Pentax-M 75-150mm f/4 Zoom Vintage Lens Review John Riley reviews the SMC Pentax-M 75-150mm f/4 Zoom vintage Pentax K mount lens, with the full-frame Pentax K-1.
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