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Sigma 50mm F1.4 EX DG HSM

Review Date: Mar 30, 2009 Recommend? yes | Price paid: Not Indicated | Rating: 9 

Pros: Sharper than most 50s in a wide area at f1.4-2.8; excellent bokeh, good contrast
focus shift on stopping down (needs +8 microadjust on my body wide open, but +4 gives better results from f2.5). Perhaps corner sharpness at optimal apertures (5.6 and 8) not quite as high as conventional 50s. Heavy and large.

This is a marvellous lens to use if what you want is blurred backgrounds at wide apertures. It's sharper in the central area ( a generous central area) than any f1.4 I've used at f 1.4 to about f 2.5. And the bokeh is lovely. So it's exquisite for those purposes. But if you are using it as a general purpose lens at 2.8, 4, 5.6 and 8 then you are probably wasting your dough. It's good at these apertures of course, but no better than a canon 50 1.8 (and therefor I'm guessing any other good prime 50). So you are paying a lot for very heavy lens in that case.

But of course that lovely result at f2 is worth the money for me....