All About Photographic Lenses. Specifications, comparison, reviews, MTF-charts for lenses by Canon, Nikon, Sony, Pentax, Olympus, Sigma, Tamron, Carl Zeiss, etc.
The Tamron SP 70-150 mm f/ 2.8 Soft Adaptall-2 model 51A is a telephoto zoom lens with constant lens speed for 35 mm SLR cameras popular in the 1970-70s (via the interchangeable Adaptall-2 mount).
By means of a special ring you can control soft-focus effects, which may be useful for portrait photography.
The lens is multicoated.
SP (Super Performance) - the lineup of Tamron best lenses.
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