Tamron SP 35 mm f/1.4 Di USD
10. Autofocus
We can't admire the speed of the autofocus because it's not especially fast – mind you, we deal here with an instrument which should meet very demanding criteria of photojournalism. Running through the whole distance scale and finding the focus takes 0.8-0.9 of a second and it seems the mechanism performs a bit slower when it runs from the minimum focusing distance to infinity than the other way round. As a kind of consolation you can add that shooting in a range typical for journalistic work, so from more than 0.5 of a meter to infinity, all operations never take longer than one half of a second.
When it comes to accuracy we can't complain. The number of misses during our tests reached just 2.5% so was sensibly low. In the case of the cooperation with the Canon 50D we saw a distinct tendency to back focus but that problem could be overcome by microcalibration from the level of camera menu. In the case of the EOS 5D Mark III the lens didn't need any micro-adjustment and always hit where it should.
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| Canon 50D, f/1.4 |
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| Canon 5D MkIII, f/1.4 |
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