In article <z-ednTTJGrG4EWLanZ2dnUVZ_jGdnZ2d@[EMAIL PROTECTED]
>, KC
kc12345@[EMAIL PROTECTED]
says...
> I have a Canon S3 which does a great job setting exposure (outdoors).
So
> that I could take better pictures of objects, I recently purchased both
a
> light box and a six foot wide white backdrop. I have two 85 watt photo
> light sources. I tripod mount my camera.
>
> What I want to get is a low-noise, adequately exposed image that needs
> minimal photoshop touch up for improvement.
>
> I am baffled that using the 85 watt lights and backdrop (or lightbox),
the
> Canon S3 underexposes all shots and requires use of additional lighting
to
> get proper exposure. White backgrounds appear gray. If I have the
camera
> bracket exposure, the longer exposure is light enough which shows there
is
> enough light for the camera to get a good shot, but it just isn't
> calculating things correctly.
>
> Because there are so many settings, I used menu/reset to reset to
factory.
> Set the ISO to AUTO, and took photos in both P and AUTO mode. I still
get
> the same result. Gray whites.
>
> Loading an image into photoshop shows the shutter speed of 1/60 second.
F
> stop of 3.2 (seems high since the camera supports 2.7). I can't tell
what
> ISO the S3 used for the shot.
>
> Since the Canon can adjust aperature, shutter speed and ISO, why would
it
> constanly underexpose these images?
>
Because it doesn't know there's a big white sheet in the picture - it
expects everything to average out to grey. Either give it a stop or two
of exposure compensation (as you would with a backlit subject) or meter
close to the subject so the camera doesn't see the backdrop.
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