Im trying to learn how to bracket with my D70. After reading the manual and following directions, I still cant figure out what I may be doing wrong, so I need your input. I shoot a 3 series set at ± .3, then shoot another series at ± .7, and a third series at ± 1. The aperture is priority so the speed changes from shot to shot. OK, now the issue, I cant find the shot that is equal to the auto shot in the three series. All three series should have one shot that is the same speed and aperture setting no????