Sigma 35mm f/1.4 EX DG HSM Lens Review by Bryan Carnathan at The Digital Picture: The best lens Sigma has ever made?

"The Sigma 35mm f/1.4 EX DG HSM Lens, like all of Sigma's best lenses, uses HSM (Hyper Sonic Motor) AF. Autofocusing is internal and very quiet, making a light shhhh sound with some clicks being audible to the photographer if shooting in a quiet environment. Autofocusing is quick, though my perception is that the Canon EF 35mm f/1.4 L Lens focuses slightly faster when using both side-by-side.

Autofocus accuracy is of course paramount when making use of the great f/1.4 image quality with its shallow

DOF. And autofocus accuracy is where I have run into problems with so many non-Canon (or Nikon) lenses in the past, so I was nervous about subjecting such an otherwise stellar lens to the AF testing. The good news is that the Sigma 35mm f/1.4 EX DG HSM Lens performs well in this regard.

While it is not perfect, I'm finding the Sigma 35 to perform close to the Canon 35 L in AF accuracy. A somewhat consistent and quite noticeable front focus problem on both of my 5D Mark III bodies required AFMA to correct. You may want to capture multiple images in situations with especially shallow DOF - which will be closer to MFD (Minimum Focus Distance). Note that the focus-and-recompose technique can begin to fail as shallower DOF is achieved.

AI Servo performance is decent at f/1.4 and very good with the additional DOF delivered at f/2.8. My keeper rate was reasonable when capturing action with this lens.

Subjects in the Sigma 35 frame change size modestly as they go into and out of focus, but the image remains stable during focusing (subject framing changes with focusing on some lower quality lenses). FTM (Full Time Manual) focusing is available and filters do not rotate with focusing.

I mentioned the focus calibration problem. The Sigma 35mm f/1.4 EX DG HSM Lens "... is compatible with the Sigma USB dock and Optimization Pro software to adjust and fine tune focusing parameters." [Sigma USA] Sounds like a great idea to me - one that could prevent MANY repair tickets for Sigma - and save time for the lens owner. The Sigma USB Dock and software was yet available for purchase at review time, but I expect that the focus calibration problem will be resolvable in the lens with this accessory (shown below)."

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