the 50/1.5 uses a 40mm filter as Joe said, but the proper lens hood for this lens uses series 7 filters, not the smaller series 6, as used on the Canon hood for the 50/1.8
Canon went with a larger dia. hood to avoid vignetting on the 50/1.5
The Tiffen Series VI #603 adapter fits the 40mm threaded lenses. It is unmarked for filter size, or that it is for Canon lenses. Just the blasted #603. Like a #611 is for a Summarit. Got these memorized? Series VI hoods are pretty easy to find. As are VI->VII step-ups.
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