i just starting using flash with my large format equipement. here is my question . i know that the sync speed is not important with large format lens since they are leaf shutters. but here is the question. if i use a flash meter and get a f stop of say f22, if i place the shutter speed at 125th of a second, the amount o f ambient light entering the camera is different than if i set the the shutter s peed at 1/2 second for example. my question is, how do i determine the shutter s peed to set the flash so that the ambient light exposure and flash exposure is c orrect? thanks