yamatama wrote in post #17175765
Today Ive received my lens and Im really disappointed
.. it has massive focusing problems. It wont focus right from any distance. Was really excited for this lens, might as well spend $60 on the USB dock. Has anyone had problems after using the Dock? Whats the difference between using the dock and another MA method?
I believe that Sigma came out with the whole USB dock so that they could have wider tolerances in their build process of the Art lenses. That keeps production costs down and still allows Sigma to keep a price advantage while providing excellent optics. This also nets them some extra cash from the sale of the dock, another win (for them). And it also decreases the amount of lenses switched constantly by customers trying to find one that is sharp on their camera or also reduces the volume of people sending in their lens for service/adjustments since they can now do the calibration themselves at home.
Anyways, I had to use the dock on mine. Trying to get the 4th and farthest focus distance correctly adjusted took a bit of time for me, but once I did get it set, I've never had any problems with it since. It works like a beauty now.