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Mar 11, 2020 · I have updated the firmware on my Nikon D7100 to C1.04. At that moment, my Nikkor 18-200mm f/3.5-5.6G AF-S ED VR DX was on the camera, and I did not notice any problems. Today I put my Sigma 17-50mm f/2.8 EX DC OS HSM on the camera (my walk around lens) and discovered that autofocus was no longer working. Mar 06, 2020 · The Sigma 17-50mm f/2.8 EX DC OS HSM lens (herein referred to as the ‘Sigma 17-50mm’), by contrast, takes things up several notches in all. Jan 19, 2020 · But first impression was that the Tamron zoom ring is MUCH easier to turn than the zoom ring of the Sigma 17-50/2.8. The Sigma was IMHO too stiff and sticky to use where you were constantly working the zoom ring, as in shooting gym sports. The Sigma zoom has a short 60 degree throw, vs the 90 degree throw of the Tamron, and that is part of the.