Sigma S 70-200 mm f/2.8 DG OS HSM
10. Autofocus
Of course if you employ the shortened range, from 3 meters to infinity, the lens is noticeably quicker and its focusing time amounts to about 0.4 of a second.
The quality of performance and focusing times don't noticeably change after attaching the Sigma to the older Canon EOS 50D.
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It's worth adding that the speed of the focusing mechanism and its range can be adjusted after connecting the lens to the USB Dock.
The accuracy of the focusing was quite high, both during our studio session and while shooting outdoors. We got not more than 2% of misses, a very good result. The tested lens also didn't have any visible problems with front or back focus, no matter what camera body it was attached to.
Canon 50D, 135 mm, f/2.8 |
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Canon 50D, 200 mm, f/2.8 |
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Canon 50D, 280 mm (TC), f/4.0 |
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Canon 5D Mk III, 135 mm, f/2.8 |
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Canon 5D Mk III, 200 mm, f/2.8 |
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Canon 5D Mk III, 280 mm (TC), f/4.0 |
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