Tamron AF 180mm f/3.5 Di SP A/M FEC LD (IF) 1:1 Macro Lens for Konica Minolta and Sony Digital SLR Cameras Tamron AFB01M-700. I owned this lens for almost three years and I find it to be a perfect fit for the task it was designed: portraits of bugs and flies. You can use it for portraits of people, but don't even think about this lens as a substitute for a 200mm f/2.8. The autofocus is awfully slow and noisy. The A850 firmware 2.0 slightly improved this situation. When shooting macros, I generally use the lens in manual focus mode so neither the focusing speed or noise is a concern. Thanks to the long focal length, I have a large working distance and take my pictures without scaring the insect and causing it to fly away. Even ... Internal focusing system maintains overall length during focusing Two low-dispersion glass elements compensate for chromatic aberration . »
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