Funny question: I have a Hasseblad 500 series camera with a 80mm CF lens, and when you twist the aperture ring on the lens, the apertures click on the "whole apertures (f/2.8, f/4, f/5.6, and etc.)" as well as the "halfway apertures" in-between the whole apertures. I'd imagine that these halfway apertures are usable. But the shutter speeds don't seem to have any in-between points because the shutter speeds only click on the "whole stops (1/60th, 1/125th, 1/250th, and etc.)." So are there really no in-between shutter speeds? And I take it that there's no way to set 1/3rd stops? Thanks in advance for clearing up my uncertainty!