This lens was billed as an "Economy lens". The 50/2.2 is a 5 element in 4 group lens, a 1-2-1-1 layout. The rear doublet of a traditional double Gauss 1-2-2-1 layout was combined to an element of higher power. In 1961 it was 40% less cost than the 50/1.8 (6 elements in 4 groups) and 25% less than the 50/2.8 (4 elements in 3 groups) as priced in 1959. The rear element of this lens is a proportionately large diameter, about the same as the front element, compared with most double-Gauss lenses.
I do not have the "prescription" for this lens, which would be in the patent. BUT- I am guessing that it uses less expensive glass than the special high-index of refraction/ low dispersion elements found in the later Canon lenses. Maybe that's why the inner surfaces are in such good condition, often not the case with other Canon lenses.
Very overcast today, but wanted to get a quick test in. Next sunny day, will get some better images with this lens. I also have my recently acquired clean-glass 50/1.8 to compare with.
Here, you can find out about Canon's S Lenses > 50-85mm > CANON 50mm f/2.2.
global.canon
To add- 10 years ago this lens sold for $750 or so at some auction sites. This one is in top condition, and was ~$100 shipped from Japan. I've picked up several lenses out of Japan this year at a fraction of the cost they commanded a few years ago. Maybe the new generation is inheriting collections and selling them off? I don't know, but it's given me a chance to grab some lenses that were way to pricey not long ago.
All wide-open, out of necessity. It was a dull-gray day.
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