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eheathNikon to canon works great as long as it has a manual aperture ring, it sounds like the lenses you are looking at are the older film ones.
Buy an adapter from here (or three, theyre super cheap)
When I owned a 40d,I bought one just like the ones for sale in like 2011 for a nikon 50mm lens but i dont think the seller exists anymore, they are all basically the same, just research each one, read reviews, but the flang distance on nikon is like 1mm longer than canon so all it needs is a very thin piece of metal to adapt. Let me know if you have anymore questions.
TodwallnutsA nikon film 50mm 1.4 from at least 1990 or so is the sharpest lens I have ever shot with. Easily comprable to the Canon L series and it only costs about $50 plus a ten dollar adaptor.
DingoSeanIt's easily sharper than any L-ZOOM lens, at least... I'd say the 135L or 85L would be far sharper (neither of the 50L's would be though.. those things are pretty dull and distorty - esp. the f1)
50$ would be a really good deal on a nikon 50 1.4 AI/AIS though... you're spending at least 120ish for a good copy if you really want that.
an older 1960's Nikon 50 f1.4 would be about 50-60$, but will flare a lot more due to more rudimentary coatings of the era.
TodwallnutsThe quality in comparison to price is a steal and still incredibly sharp images can be made. The chromatic abberation and distortion are what give it character and give the opportunity for some great shots you can't get on a $1200 lens.