Paul, you said: "On *istD the shutter has to be open at least 1/125 to synch with the flash..."
I totally don't get this. I shoot with mine right down to a second sometimes, and the sync speed goes up to 1/150. Can you explain what you mean by this? tan -----Original Message----- From: Paul Stenquist [mailto:[EMAIL PROTECTED] Sent: Tuesday, 9 March 2004 6:07 AM To: [EMAIL PROTECTED] Subject: Re: Frightening *istD experience Flash exposures are based primarily on f-stop. The flash duration is the timing element. On *istD the shutter has to be open at least 1/125 to synch with the flash, but the flash duration fills only part of that window. I can get approximately the same flash exposure if the shutter is open 1/30 but more of the room light will intrude, affecting the color balance and exposure. Shooting at f16 @ 1/125 in a moderatly lit room, the ambient light is largely "killed." It's a minimal part of the exposure and has no real effect. Shel Belinkoff wrote: > OK, I suppose this is some "flash fact," so forgive my > ignorance. How does the shutter speed "kill" ambient > light? What do you mean by kill? > > Paul Stenquist wrote: > > > > Good idea for the studio shoots. I always shoot at 1/125th, because I > > like as much shutter speed as possible to kill the ambient light.
