Bingley
Veteran
What is not as well known with the Black Canon 50/1.8: The early ones have more aperture blades, can be found with 11 blades- not the usual 8. I also believe early ones might have better condition glass. I am guessing that Canon switched to a different lubricant somewhere around 1958. Maybe luck of the draw, but my Canon 50/1.2 and 50/1.8 are both early, both have perfect glass. I've had several later ones- damaged/etched glass.
The Black lens uses newer glass than the chrome lens: a glass with low dispersion and high index of refraction. I also have a perfect-glass chrome 50/1.8. The black one is sharper, higher contrast. The Chrome 50/1.8 is improved over the 50/1.9, and all are better than the Canon 5cm F2.
My sample is a later black and satin chrome, from the ‘60s. Serial No. 328***, 8 blades. The glass on mine is very clear and clean, but then it’s been cleaned twice, the first time by Sherry Krauter and the second time by Youxin Ye after the haze returned.
The lens remains a very good performer. I particularly like the way it renders out of focus areas: very smooth, painterly.
wide open:

f2 or f2.8:
