Sigma C 150-600 mm f/5-6.3 DG OS HSM
10. Autofocus
Still you have to remember there is a focus limiter, shortening the range. If you choose the option from 10 meters to infinity it will allow you to shorten the focusing time to about 0.5 of a second.
When it comes to the accuracy of the mechanism it was beyond reproach in a range from 150 to 300 mm. At the longer focal end there were mistakes but their number in studio conditions didn’t exceed 4%.
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The lens didn’t have any noticeable front or back focus tendencies and didn’t need any microcalibration either on the 50D or the 5D Mark III.
| 50D, 350 mm, f/5.6 |
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| 50D, 600 mm, f/6.3 |
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| 5D MkIII, 350 mm, f/5.6 |
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| 5D MkIII, 600 mm, f/6.3 |
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