> I wanted maximal depth of field. First I shot in Av
> mode at f22. However, as you all know, this resulted in extremely long
> shutter speeds since the camera was trying to expose the background and the
> room was lit with regular light bulbs, most of which I turned off after
> focusing as I wanted the daylight color balance of the flash. So I tried
> manual mode and set the diaphragm to f22, but didn't know what to set the
> shutter to. I empirically picked 1/30 (camera on a tripod), but realize that
> the exposure would be set by the very short flash duration. Could I have
> used 1/125, for example?
>
IMHO Manual mode is the way to go. Depending on how much light you'll need
and how powefull the flash is sticking to a slower shutter speed would
be best (1/30). Even more so if you use a bounce. Just set the flash
exposure to match the subject (bright flower +1 - +2).
Ignore the exposure indicator in the viewfinder. It will indicate the
exposure of the background. (Unless you want the background at a certain
exposure)
I shot these with this technique...
http://www.photo.net/photodb/folder?folder_id=109005
http://www.photo.net/photodb/folder?folder_id=106854
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