Tamron 70-200mm f/2.8: Performance
Any lens entering the marketplace in this focal range is up against some very stiff opposition and this offering does manage to stand up well. Edge performance, on a lens that is designed for full frame sensors, stays close to that of the centre, and commendably so.
Slight softness, which is measurable but not so obvious to the eye, when the lens is used wide open, quickly sharpens up as the optic is closed down and the optimum is reached between f/5.6 in the middle of the zoom range to f/11 at the longest focal length.
There is little degradation as the focal length increases (another good sign) and good contrast is maintained throughout the focal range.
Chromatic aberration is so well controlled that there is little point in mentioning the phenomenon here. It is not detectable by eye and measurements are minimal, well within tolerances. The same can be said of the distortion control.
The one place where this lens is let down on the performance front is in the focusing speed. While it's no slouch, it's just not up to the same level as the sonic motors of the opposition and is certainly more audible. Tamron really do need to get themselves a sonic system.
more : ephotozine
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