I am always a little amused when someone estimates the size of a print which can be made from a 35mm negative or slide. The reason is that medium format equipment is very reasonable now and is suitable for much larger prints. I received a working Bronica GS-1 today from an eBay seller. The price? $17.16 (US) + shipping. You still need a back, a lens and a finder to start shooting but those parts are not very expensive either. How large a print can I make with the standard 100/3.5 Zenzanon? Much larger than what you will get with any 50mm lens and 35mm film.
But this is the 35mm forum and a thread about Olympuc OM 50mm lenses. Not Bronica