Dear Boris, According to the F100 literature I have, you can still set the aperture by using the lens aperture ring. However, F100 doesn't seem to have a ADR (Aperture Direct Readout Window) in the viewfinder, so it may be inconvenient to do so. By the way, there is even a special custom function No. 22 that you can choose which allows you to control the aperture with the lens aperture ring only. -- Ivan
