Originally posted by RolloR what? of course you need them all.
the 1.4 has got 8 aperture blades (am i correct?) so it should give an octagon bokeh, while the 2 and 1.7 will give hexagons when stopped down
I kind of feel the same way about this, that you can never have enough in the 50 range. It's this focal length which most clearly shows us photographers how the optics engineering has such an effect on the image. And there is never a redundancy in owning as many as you can reasonably afford.
I have a Helios 44-2 (58mm f2) which I got for 15 bucks, and there isn't a lens out there that can do what this does as far as Bokeh goes. And the IQ is outstanding.
This is the fun of photography to me. Going out with the primes (and for me all manual primes), and knowing that they will all perform differently. Not necessarily better or worse in a given situation, but just differently.
Kind of like being single and dating different women.