Quote Originally Posted by medform-norm
When measuring light, we mostly work with the EV scale - anyone else does that?
This can be convenient but confusing - for some people, EV1 is just the combination of the aperture f1.4 and an exposure time of 1 sec., without regard to film speed, and LV1 is a brightness level that needs an exposure of 1 sec. at f1.4 with ISO 100 film. Others use EV for this and specify the sensitivity of, for example, exposure meters in EV. As the number of cameras with Compur shutters with the irritating EV interlock grows less, the EV=LV usage is probably the only one worth worrying about.