Both are excellent, of course. Since you have zooms that cover both focal lengths, check past EXIF or set a zoom to each focal length for a while, and see where the thin DoF would be more useful.
Each lens has one 'issue'. The 50L exhibits focus shift (inherent to the lens design, you'll get backfocus at apertures between f/1.4 and ~f/4 with close subjects). The 85L autofocuses quite slowly (and manual focus is no faster because MF works by driving the AF motor).
I have never heard that - how does that work? Do you mean like the 50 f/1.8 where you have the resistance of the motor (it never de-couples)? I always wondered if that effects the life of the motor or any gearing that may existOriginally Posted by neuroanatomist
... it just doesn't feel right.
5DS R, 1D X, 7D, Sigma 10-20mm f/4-5.6, 24mm f/1.4L II, 16-35mm f/4L IS, 24-105mm f/4L, 50mm f/1.8, 100mm Macro f/2.8L, 70-200mm f/2.8L IS II, 100-400mm f/4.5-5.6L, 580EX-II
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