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The famous Tamron SP 350mm f/5.6 mirror lens delivers in the resolution and contrast department, with very crisp shots at other than minimal focal distances. Up close, the sharpness drops to a mediocre level. Vignetting is pronounced, distortion negligible. Build quality is very high but the lens has a tendency to develop a separation between two rear elements so you should take care when buying. Note as well that presently price tags are very (unreasonably...) high for this lens. If you're looking for a good closeup tele lens, please consider the SP 300 mm f/5.6 lens which offers even better sharpness throughout and much nicer background rendering or alternatively the Sigma Apo Tele Macro 300 mm f/4.