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Rating: no ratingManufacturer's Description:
"Tamron's fast fixed telephoto lens delivers a remarkable and exacting performance, as demanded by todays professionals. Two large LD (Low Dispersion) glass elements in the front group provide high contrast and crystal-clear image quality at f2.8. and the floating focusing system improves optical performance especially at close shooting distances.
9 specially shaped aperture blades form a near perfect circle to create excellent background blur for portraits. The true value of this lens is apparent when photographing sports, low-light theatre performances and wildlife.
Available in Canon, Nikon and Minolta AF fittings. The lens also features a new AF/MF switchover mechanism*
* AF/MF change over mechanism for focusing ring Switching between AF and MF is easily accomplished by sliding the focus ring back and forth. Manually focusing is smooth and precise with the wide focusing ring."