For what it's worth, I have the F5 and it's a dual wheeler camera. When I use it in manual mode, it's nice but IT IS SLOW in comparison to the F3HP. The wheels are good because they support smaller steps than the dial on the F3 but to change shutter speed from 1s to 1/125 it does take some time. So I don't think the N90 is slower than the N80, but they are different.