Originally Posted by
timbo2410
yes the dock is a must in my opinion ... fine tune lens .. don't use the standard distance .. according to Sigma it is best to calibrate at the 3, 6, 15 and 30 metre ranges as it gives a better algorithm for focus .. don't ask me .. that's what they said .. it made a huge difference with mine and you can also adjust focal speed etc with the hub .. great bit of kit .. use a spyderlenscal for the shorter ranges but I made my own larger calibrator for the 15 and 30 metre ranges .. I can also test it at 50 and 75 with great results compared to the non calibrated shots.