Thanks, Godfrey I think I follow that. Another question....
If I wanted to do fill flash with either of the external units, I could do that by dialing in a negative amount of flash compensation? Or have I got that screwed up? Cheers, Brian +++++++++++++++++++++++++++++++++++++++++++++ Brian Walters Western Sydney, Australia Quoting Godfrey DiGiorgi <[EMAIL PROTECTED]>: > If the *ist DS circuitry is like nearly any other camera I've had > > with dedicated flash metering circuitry, as long as the body and > flash are communicating, the flash exposure compensation simply > sets > the flash metering's quench signal to the flash unit higher or > lower > depending upon how you set it. > > So, for instance, if the FEC is set to -0.5EV, the quench signal > will > go to the flash when the flash metering sensor records .5EV less > than > the nominal normal flash exposure is received. > > This is independent of the Exposure Compensation setting for the > ambient light metering because the ambient light meter uses a > different sensor setup. The P-TTL system should use both ambient > and > flash sensors, makes its exposure evaluation prior to actual > exposure > time. The TTL flash metering operates at exposure time only. > > Both the AF330FTZ and AF280T are dedicated units allowing the DS > body > to do TTL flash metering so the FEC control is active. They don't > > support all the functionality of the body or P-TTL mode, but they > > support everything the body can do with respect to their > capabilities. > > My flash, a Sunpack 383, is not a dedicated unit and has its own, > > independent flash metering system. The body knows nothing about it: > > the body and lens have to be set manually for shutter speed and > appropriate aperture when using it. > > Godfrey > > > On Feb 5, 2006, at 5:42 PM, Brian Walters wrote: > > > I'm a bit confused about the flash compensation capabilities of > the DS > > - not surprising really, even after many years of photography I > still > > find flash a dark art. > > > > I originally assumed that flash compensation was only available > with > > the built-in flash. The manual doesn't actually say that but it > talks > > about flash compensation in the same section as it discusses the > > internal flash, so I put 2 and 2 together...... > > > > Anyway, after experimenting a bit with compensation using the > internal > > flash, I attached the AF330FTZ and found that the flash > compensation > > indicator still appeared in the viewfinder, suggesting that I > could > > get compensation with the external gun as well. I then attached > the > > old AF280T and got the same result, which I found surprising. > > > > So, can anyone explain the flash compensation capabilities (or > lack > > thereof) with external flashguns? > >
