It is the general concensus that all 50mm 'normal' lenses are very good, and I would agree with that, but there are a few that are special and this is one of them. It has everything, extreme sharpness, excellent contrast and microcontrast, rich vibrant colours, smooth bokeh, it just paints beautiful images with exceptional quality. Amazing for a 1960s lens, I directly compared it to my CZJ Biotar 2/58 of the same age and the Topcor blows it away, in fact, the Topcor can compete with much later and more well known top lenses such as the Contax Planar 1.7/50 and Leica Summicron-R 2/50.
That 58/1.8 is a seriously sharp lens. The mount is physically interchangeable with the Exakta mount. - Nathan Tenny
The mechanical quality and finish are both top shelf too, the smoothness and damping ofthe focus mechanism is a joy to use, in terms of engineering excellence, this surpasses all others, even the Leica Summicron-R 2/50.