Reviews and Problems with Tamron SP AF 28-75mm f/2.8 XR Di LD Asp
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20 March 2015
Summary: Tamron is a third party manufacturer that makes a range of lenses to fit the main manufacturers' cameras. The 28-75mm Tamron lens comes with a Canon, Nikon, Pentax, or Sony mount, and it is equivalent to a 45-120mm lens on a camera (if using on a crop frame camera).
Excerpt: This lens is one of my all time favorites. It's fairly light, tack sharp, and has a decent zoom range. The main problem is with mountaineering you tend to want either wide angle or telephoto, which this lens is neither. So, you end up taking multiple lenses with you on a trip.
Tamron AF 28-75mm f/2.8 SP XR Di LD Aspherical (IF) - Review / Test Report
26 March 2011
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.