Tamron 35-150 mm f/2.8-4 Di VC OSD review - Autofocus

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Tamron 35-150 mm f/2.8-4 Di VC OSD

2 January 2020

Arkadiusz Olech

10. Autofocus

The ergonomics of the Tamron's 35-150 mm autofocus is superior to ergonomics of the mechanism featured by its 17-35 mm brother. Firstly, the device is quieter although not noiseless. Its speed didn't improve - covering the whole distance range and confirming the focus takes over one second and that time doesn't depend on the direction or focal length. Unfortunately, such a result can be only called weak, leaving a lot of room for improvement.

On the other hand, when we took sample shots or tested the Tamron in our studio we didn't experience any accuracy problems. The number of misses didn't exceed 2% and its a low level.

When it comes to front or back focus tendency we noticed a distinct difference in performance between two bodies, used in our test. In the case of the EOS 50D there was a significant back-focus which grew with the increase of the focal length. It couldn't be corrected from the camera's menu level and we had to use the TAP-in Console.

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In the case of the Canon 5D Mark III we didn't experience any problems - at all focal lengths the lens always hit where it should, without the need of any calibration.

Canon 50D, 100 mm, f/4.0