>I've heard that many Sigma lens do not focus properly with >the D800. >Be sure to download latest firmware from Sigma. > >The D800 is much less forgiving of user error than the D200, >actually it just shows those errors much better. > >Try using a TriPod, F/8, and speed over 800s. >Go to Picture Control and try bumping the sharpness level up a >notch or two.
What do you mean download Firmware from sigma ??? you can install sigma firmware on your D800 ??