It was the kind of shit useful in the film era.1000% Canon says just use the current 50 1.4 on an adapter. They have not looked at that lens in so long they forget how shit it was.
Now, if you want to redo it to be non-shit for modern sensors, it will weight and cost 3 times as much. Given that ISO 3200 is the new ISO 400 now, the lens will have a dubious value.
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