I often use a D70 with Sigma 8mm and here's what I do for most work. I rarely bother using a preset wb and use Auto WB, shooting raw allows you to alter the wb later in Nikon View or Nikon Capture to get the most accurate results. Just use the same wb setting for each image in a set.
Take first shot in Mode A with aperture f8, note shutter speed then switch to M mode set aperture at f8, shutter speed to above, turn off Auto focus switch on lens and set to infinity, take shots, check exposure with histograms (keep on the dark side as will be lightened later when correcting light fall-off). Adjust shutter speed and take another set if necessary. 200asa for most situations.
Hope this is of help
Simon
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