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Tamron 28-75mm f/2.8 Di

Tamron 28-75mm f/2.8 Di Specifications
Frame Coverage 35mm
Lens Construction (groups) 14
Lens Construction (elements) 16
No. of Diaphragm Blades 7
Minimum Aperture 32
Closest Focusing Distance 0.33m (13")
Maximum Magnifcation 0.26x
Filter Diameter 67mm
Maximum Diameter x Length 73mm x 92mm (2.9" x 3.6")
Weight 510g (18oz)
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.
Eric Tischer
The Tamron focuses quickly, although the focus ring turns in AF, considering the price, this doesn't bother me. The front of the lens does not rotate which is nice. It has a loud ring/click when it is stopped down, almost like there is a little bell inside, it's quite loud. The noise can be heard after each shutter release.
The Tamron 28-75mm f/2.8 XR Di Lens is a relatively small normal zoom lens that delivers good image quality and a wide fixed f/2.8 aperture for a low cost. It is a good choice for 1.6x FOVCF Digital SLR users.
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