bruce
The factory calibration was terrible. Ive never had a lens that was so poorly calibrated. At first the best I could do was with in camera microfocus correction of +15, but the focus correction was range dependent so anything further than about 4 feet was still out of focus. I went ahead and order the Tap-in Dock. This wasnt easy to find since it was discontinued for Sony so I had to get one shipped from Japan on Ebay. When I finally got it calibrated the settings that worked okay were: +20 at near range, +20 at mid range, -5 at far range and also +10 in camera. (20 is the max so I need to add in camera on top of the Tap console adjustments). Before I got the focus calibrated, it was very disappointing. It would miss focus or continuously hunt. Ill see if my opinion improves now that Ive got it adjusted... Other things: the build quality is good. The manual focus ring is smooth and nice to use (had to use a lot of it when autofocus was broken). So reviews said that the coating eliminated ghosting. This wasnt my experience. I took some shots with bright sun in the background and there was a clear reduction of contrast.