Is it silver or black? The black ones are newer and suposed to be more desirable. I forget what the difference is, probably coating. I will have to get my Canon Rangefinder book out if my son will let me and read again about the differences.
Canon Rangefinder Cameras 1933-68 by Peter Dechert, "Canon's finest 50mm optic, the F1.4, was introduced in 1959..." I remember a comment somewhere, I thought it was in this book, specifically recommending the Canon 50/1.4 and 1.8 for LTM cameras. Steve Gandy recommends both, http://www.cameraquest.com/ltmlens.htm. The black lenses are more recently introduced lenses than the chrome ones, I don't know specifically what changes were made optically. The 50/1.4 replaced the 50/1.5 so these two obviously are different optic designs.
The Canon 50mm F1.4 is a Xenon formula lens; the Canon 50mm F1.5 was a Sonnar copy. I have the 50mm F1.4 on a Canon 7; it is sharp but lower contrast than a Nikkor of the same period. I do not have the F1.8; but I was told my the person who sold me the F1.4 that the F1.8 was a bit sharper. The F1.4 lens is the only 6-element F1.4 that I know of; most were 7 element designs. Canon started using a lot of new glass in the late '50s to reduce the number of elements in their lenses. I love my old optics books.
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