|Sigma AF 50mm f/2.8 Macro (Minolta/Sony A Mount)|
Here is a Sigma AF 50mm f/2.8 Macro in Minolta/Sony A mount. This lens came along with a set of Minolta lenses and Minolta i7700 film SLR. I do not own this lens and neither have used it for testing. Based on my impression of the mechanism, it's just like my Sigma 28-80mm D, which has very smooth focus and zoom rings. Although the autofocus is screw driven, the lens sounds very quiet. The focus ring is especially a pleasure for manual focusing.
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