Well, I used to set the shutter speed first and then adjust the aperture so that the 0 led light up. After that I would change the aperture to give more or less exposure if I think it needs. I do not have take my eye away from the viewfinder to adjust the shutter speed although I use 2 fingers instead of just the index finger. I still do that when I have the F3HP and FM. On most cameras like the FM I would have to adjust the aperture last in order to have the 0 led light up by itself. The F2 is one of few that you can set the shutter speed in between steps but I never used it that way.