Reviews and Problems with Tamron SP AF 28-75mm f/2.8 XR Di LD Asp
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Value for money 8
Overall quality 5
Build quality 6
Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) - Review / Test Report
19 April 2012
Conclusion: The Tamron AF 28-75mm f/2.8 SP XR may shine with glory on APS-C DSLRs but it has found its master within the full format scope. The border resolution is generally soft at f/2.8 and you need stop down a bit in order to get a decent image quality across the frame. The lens produces very hefty vignetting figures at f/2.8 but the situation improves rapidly when stopping down a bit.
Summary: The Tamron 28-75 mm is a nice, pretty compact and fast lens, designed for cameras with a full frame sensor. Use it at f/2.8, and you will have images with a good center sharpness and a nice bokeh. Use it at f/5.6, and you will be rewarded with a center sharpness even better than at f/2.8, and a very well-behaved sharpness across the framel.
Summary: The Tamron 28-75 mm is a pretty fast lens and is designed for full frame cameras. If you use a camera with an image sensor of the APS-C format, you will have immediately largely lost lens errors such as vignetting and distortion. Besides, the difference between resolution in the center and the corners is sharply reduced. This lens performs better in terms of resolution, distortion and vignetting than all EF-S zoom lenses of Canon including the 17-55 mm.