Reviews and Problems with Sigma APO MACRO 180mm F3.5 EX DG /HSM
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Nikon Sigma 180 Macro, inconsistent auto focus
Karl Bryan "classic camera user", Amazon
11 November 2008
Summary: I purchased this lens because I wanted more distance when taking macro photos. As I do with all new lenses I purchase, I calibrate the AF (I have a Nikon D300 with AF Fine Tuning capability). What I found is that the AF on this lens has too much back lash to consistently focus. I took 5 pictures of a static object using a cable release and the camera mounted on a tripod. Before each picture was taken, I would rotate the focus ring either clockwise or counter clockwise.