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As I was looking at these, I did actually think: 'Richard is going to hate the Sigma'.
I've always been a bit mystified by the 'good' and 'bad' bokeh comments: the only thing that seems consistently objectionable, aesthetically, is a distractingly busy rendering of foliage and grass. Lenses that are good at this usually have 'weakly' drawn defocused highlights, and personally, I don't mind a nice, uniformly circumscribed light disc.
What also pushes my buttons is a loathing of hexagonal (or, worse, pentagonal) discs or those that distort at the frame edge. The Sigma scores points in my book for keeping it circular right up to f5.6.
It might be regarded as 'good bokeh' not to outline this defocused white power lead, but again I'm not sure it looks right – though the Sigma handles foliage with aplomb. Perhaps Richard's 'more interesting' Zeiss bokeh is preferable here . . .
You'll notice here that the Sigma 50mm f1.4 seems a fair bit shorter (in focal length) than most 50mm lenses.
Edited on Jul 01, 2008 at 05:05 PM