On Sat, 29 Jan 2000, Dirk and Carla Wright wrote:
>
> > Yes, and if the subject is filling thr frame fairly well, it will
> >probably work (as long as the reflectance is averaging 18 0rey, which
> >it almost never does). Reflective-reading based fill flash has all the
> >problems of all reflective systems. Only distance-based systems can
> >yield precise and accurate results.
>
> yeah, that makes sense, but the exposure setting for ambient in the camera
> is also reflectance based, correcto? ditto for ttl flash control?
Exactly. But when fill-flashing, you're usually going to have some
contrast between the ambient and the flash (the reason most people resort
to fill-flash in the first place). The flash --- unless the subject fills
the frame --- will read the light reflecting from the subject, AND the
background as well. The difference in contrast is exactly what often fools
the flash into a wrong exposure.
> hmmmm, I remember having trouble shooting a couple inside with thier backs
> to a bright window with the T20 and OM2 set to auto. The flash wouldn't fire
> until I dialed in about +1 compensation. I suppose there is not subsitute
> for the grey matter between the ears...
Amen to that.
*= Doris Fang =*
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