Many have reported excellent results with this lens when used on the Nikon D2H, however I never was able to get one in focus (and sellable) shot on mine. All focus settings were tried, tripods, high shutter speeds, static and moving objects and the results are all the same...what AF locks on is out of focus but what is about 2 feet behind is razor sharp.
It has been sent back twice for repair, adjustment, replacement and it still back-focuses. The images are useless and no amount of sharpening can save them. I asked for a replacement but last I heard they were sending it back to Japan for analysis.
I am sure that I got a bad one because it focuses just as poorly on a D100 and F4. On MF, the images are great but who would pay $1900.00 for a manual lens to be used on a camera that has an AF system as sophisticated as the D2H.
Sigma blamed the camera but the $179.00 Nikkor 70-300G lens that I purchased as a temporary replacement has better image quality than the Sigma that cost 10 times as much....as long as you have bright sun shine. To have over $2000.00 wrapped up in a lens, teleconverter and lens filter and not be able to make one penny off of it is quite frustrating.
I am only hoping that Sigma will send me a replacement that will focus perfectly on the D2H.