> i found an used 50 for low price (500 euro) but i dont know if is a piece of
> crap..anyone know if is a good lens?
If in good condition, yes. Depends on what version it is too (single coated
C, multicoated C, CF, CF FLE, CFi).
But nowadays Euro 500 isn't really a low price at all. A good 100 euros less
would be a lot better.
Unless it is of the latest CFi version. Than Euro 500 would be great.