At 11:45 AM 12/17/2002 +0100, Thomas Bryhn wrote:
At 11:07 17.12.02, Richard F. Man wrote:
Another question for the Metz users - does the SCA-321 transmit aperture
and asa information to the flash? For testings, I have been careful to
manually setting the zoom, aperture, and asa. It would be good to know I
don't have to do that.
Where should the flash get that information from, other than you? Even the
camera don't know anything about zoom or aperture (or distance). The
camera knows only ASA, how many stops from full aperture you've set your
lens at, and how much light there is. That's enough for the camera, but
the flash would need absolute aperture and/or distance to do any useful
calculations. Because the camera controls the flash (in TTL mode, that
is), there's no need for the flash to know, in other modes you'll have to
tell the flash what settings you use.
...
Well notice I only mentioned ASA and the aperture, which the camera should
know about, and not the zoom (or focal length). I guess not the aperture on
hindsight since the . OK, it makes sense. Thanks! So looks like -
- if the subject and room situation is "normal," shoot away in TTL
- if the situation requires exposure compensation, e.g. no back wall, then
either use TTL and dial in negative compensation on the camera, or use AUTO
and dial in compensation using the flash.
Regardless, the zoom should be set. The aperture and ASA only necessary for
AUTO mode.
I think I got it now.... Thanks all.
// richard <http://www.imagecraft.com>
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