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Get information and user reviews for this lens from Amazon: 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
The Tamron AF 180mm f/3.5 SP Di LD [IF] macro offers a near-flawless performance. Optically it doesn’t leave anything to be desired – the resolution is very good to excellent from f/3.5 all the way down to f/16 and vignetting, CAs and distortions are non-issues in field conditions. The bokeh (out-of-focus blur), a primary aspect in macro photography, is very smooth and buttery. The build quality of the Tamron is very good but there is one bug – the lens has no focus limiter and the rather slow AF combined with AF hunting can be a frequent and rather tiresome experience. Thanks to a focus clutch mechanism you can switch between AF and MF as easy as pushing/pulling the focus ring so if necessary you should give the AF a better hint by manual pre-focusing. Other than that it is a really impressive lens. READ FULL REVIEW