Enough with the personal bickering. Take it to PM, eh?
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Originally posted by Ikarus For my own purposes, 50s are more useful today than they used to be on FF.
(In the following, I shall mention focal-length equivalences. I refer ONLY to FOV, not to DOF nor perspective nor aperture nor any other characteristics.)
Even on 135/FF, 50-55-58mm are short teles, given that the 'normal' focal length is 43mm. Fast Fifty's are special there mostly because of speed. Equivalents on APS-C would be around 33-36-39mm. We might call these "long normal". Putting those Fifty's on 135/HF or APS-C cameras makes them equivalent to 75-82-88mm, good headshot-portrait lengths.
Many fixed-lens 135/FF RF's and VF's / P&S's had 45mm glass, closer to 'normal', or even wider, down to 35mm. Equivalents on APS-C are around 24-28-30mm. We can call these "short normal". (But who wants to be merely normal?)
IMHO the usefulness and likability of any focal length depends on 1) what we're doing and 2) what we're used to. Some absolutely love 35-40-43mm on APS-C, equivalent to 52-60-65mm on 135/FF -- long-normal or short-tele. I'll shoot those focal lengths, but not nearly as much as I do 24-28mm, equivalent to 36-42mm, short normal, great for including a subject's context. (My lens-of-the-day today is again my Vivitar-Kiron 28/2 CFWA.)
And while I shot Fifty's on 135/FF because I *had* to, I use those a great deal more on APS-C, because I *want* to. Not just for portraits -- that's a minor factor -- but because the FOV is great for concentrating on subjects -- to surgically slice them from their contexts when wide-open, or to grab every detail when stopped down. (My lens-of-the-day yesterday was a CZJ Tessar 50/2.8, 12 iris blades. Tomorrow's LOTD should be the Porst Color Reflex 55/2.8, eh?)
Some will hate or disregard Fifty's on any format because they're just not used to the FOV, and/or have become accustomed to something else. That's fine. That's about the same reason I don't go hog-wild with 35mm on any format. (Well, a 35mm lens on a 645 or 6x9cm cam would be nice.) One way to overcome this is with a LOTD strategy. FORCE yourself to shoot with 28-35-42-50-60-70mm, to see how you're induced to look at the world differently. Don't have primes there? Then tape a zoom to one focal length and shoot it for a few days.
Fifty is nifty.