> I recently shot graduation pictures with my Elan 7e. The pictures I shot
> were mostly consist of asian people with light/yellowish and dark/brownish
> skin colors. I turned ECF off and used the middle focusing-point. When
> shooting indoors, I got different results even though the elan 7e showed
the
> same aparture and shutter speed.
>
> Exposure is determined by aparture and shutter speed, isn't it?
Were you covering lots of people, i.e.. group shots or individual shots?
This might explain the varied result you got, what you should do is use
Flash Exposure Lock if the Elan 7 has this feature (on topic now?).
Was your comment of exposure based on prints done by consumer one-hour labs?
I suspect so, and if that is the case, you can probably blame the mini lab
for the inconsistent result, you should be able to get them reprinted to
your satisfaction.
But the main point of your question is the small mis-conception of aperture
and shutter speed in your believe that only those two factors control the
exposure when you used the flash in P mode. In this situation the flash is
still in automatic mode in terms of how much light energy it releases when
the shutter is tripped. The TTL or E-TTL within the camera will tell the
flash when to turn off the flash even though the shutter speed and aperture
are both "fixed".
The shutter speed and aperture you saw in the view finder is the correct
combination for the ambient lighting at the time, the camera will most
likely choose the largest aperture to minimize the amount of energy released
by the flash to maximize the distance and reduce the recycle time, but this
also means shallow depth of field (I learned this the hard way).
So if you really want to FULLY control the exposure, you need to put the
camera in Manual mode to set the aperture and shutter speed, you then need
to dial in the exact amount of flash output by setting the flash to manual
mode also, you can figure out the right setting based on the combination of
guide number of the flash, distance to your subject, shutter speed and
finally the aperture, but this is indeed OT.
Regards,
Ken
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