Sigma 311101 50mm F1.4 DG HSM Art Lens for Canon, Black
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I've both the Zeiss 55 ZA and the Sigma 50 Art, the Sigma is IMO just a touch sharper, with regards to the out focus rendering I think it all depends on the elements being thrown out of focus, I've not found either the Zeiss or Sigma to be better than the other in every situation so far, I do prefer the rendering from the Zeiss though, seems to give a bit more of a 3D look.
Used Sigma 50mm f/1.4 DG HSM ART - Canon EF Fit | MPB
Even if you’ve only skimmed through this comparison, it should be quite clear which of the three 50mm primes reigns supreme. lens the company has ever made and the construction unites 16 elements in 12 groups – a more complex arrangement than the 13 elements in 11 groups found inside the 35mm f/1. I have a Canon digital SLR (Rebel XS), and it seems whether most photographers have and shoot with a Canon, Nikon, or other digital SLR, then this standard lens is definitely the glass to choose, and use!
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Sigma 50mm f/1.4 DG HSM Art Cho Canon - Mayanh24h Ống Kính Sigma 50mm f/1.4 DG HSM Art Cho Canon - Mayanh24h
Secondly, depth of field calculations use a concept of 'acceptable sharpness' that's defined by the diameter of the 'circle of confusion'. if your photography is 100% portrait work, i can see a reason to possibly consider a super sharp manual lens, but otherwise, good luck focusing manually on fast moving subjects.
DG HSM Art, it won’t come as a great surprise that filters and adapters are mounted via an 82mm thread rather than a 67mm or 77mm one. making it particularly suited to a wide-range of uses – environmental portraiture, candid and general-purpose photography.