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I have a stack of filters that I inherited years ago from my Grandfather. They all fit a 58mm thread, so I've bought a step up ring for my lenses (which are all 49mm - 50/1.7, 50/2, 28/3.5, 135/3.5) to use a few of them, but mainly the yellow since I've been shooting b&w through my ME Super and MX. Would anyone have a suggestion on a hood that I could use with the 50/1.7 and 28/3.5 lenses, preferably metal? I have the stock Takumar circular hood for the 135/3.5 . A circular hood would be nice as I occasionally use a polarizer and it seems that the square ones might cause some vignetting with the hood turning as the filter turns. I can find the Pentax hoods or equivalents for the 49mm threads, but don't know how long of a hood I could get away with using a 58mm threaded one and the shorter primes.