Indeed fine optics but not so good ergonomics in my very personal opinion. I have small hands, but the aperture ring on this lens moves so lightly by the slightest touch and is so close to the rather stiff focus ring that more than once I unintentionally changed aperture while focusing ... Because I am shooting with an meterless M this usually went unnoticed. This was the main reason I sold the lens (I also didn't like the finder blockage). YMMV, of course.