LensTip.com

Lens review

Tamron SP AF 17-50 mm f/2.8 XR Di II LD Aspherical (IF)

27 September 2007
Robert Olech

10. Autofocus


- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

The Tamron 17-50 mm is not equipped with an ultrasound motor, which does not make its autofocus a speed champion. Moreover, it makes a somewhat irritating high tone buzzing noise.

However we have to admit that Tamron’s designers know how to create very good sharpness adjustment mechanisms even without using an ultrasound motor. The autofocus was tested on three cameras (the Canon 20D, 30D and 300D) and worked very well, didn’t show front or back focusing and, what is really important, it was wrong in only 5.8% cases. The results are similar to those achieved by Canons equipped with a USM motor and Nikkors equipped with SWM motors. Again, we have nothing but praise for the Tamron.

Tamron SP AF 17-50 mm f/2.8 XR Di II LD Aspherical (IF) - Autofocus