"KC" <kc12345@[EMAIL PROTECTED]
> wrote in message
news:z-ednTTJGrG4EWLanZ2dnUVZ_jGdnZ2d@[EMAIL PROTECTED]
>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?
>
> KC
A couple of things:
First, how do the skin tones look? Depending on how far back your
backdrop
is, your subject might be lit properly, but the backdrop could be coming
out
grey since it gets less light. With only low-wattage bulbs, your light
intensity will fall off rapidly.
Second, how much are you zooming out to frame the subject? As you zoom
out,
your aperture will decrease. Your camera's maximum aperture is only
available at widest angle focal range, or when zoomed slightly.
Hope this helps,
Dudley
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