The SB-28 is a nice flash. You'll find it's easier to use in Auto mode rather than manual. Once you set the ISO and the f stop the flash does the rest since the sensor is on the front of the flash. The distance bar will tell you if the ISO and f stop is within the flash range. It's has a pretty wide auto range. As an example at ISO 400 and f5.6, everything within 3 1/2 feet and 30 feet will be perfectly exposed. You don't have to do any math. It works for me and the exposures are right on.