--- mircea bunea <[EMAIL PROTECTED]> wrote:
> Hi!
> I have to take some pictures of a graphics
> collection, painted on
> canvases of aprox. 100 x 100 cm. the canvas
> background is pure white
> and the graphics are painted with fine black and
> dark brown lines.
>
> 1. should I take the shots in the room or open air
> (is sunlight better
> than flashlight in this case)?
Mr. Bill's advice is good. If you only have one
flash, then you're better off shooting in daylight,
but a cloudy or at least hazy day will be needed to
prevent glare and hotspots.
> 2. should I care to manage some special color
> background to contrast
> with the white (the walls are white also, but little
> darker)?
Why includethe background in the photo at all? Adjust
the framing so that you only shoot the painting.
> 3. should I use the autofocus feature of the 650 in
> the Av mode or use the selective
> measuring one?
Autofocus and AV are completely separate. AF should
work fine on this. Just make sure your camera back is
parallel to the painting.
> 4. how should I best calculate the aperture and the
> exposure?
As Mr. Bill suggested, an incidient light meter would
be best. Assuming you don't have one, however,
acquire an 18% standard gray card (available from good
photo stores where you are, I hope), and meter off of
that. Then manually set the exposure on your camera,
and bracket.
A couple of other thoughts: It sounds like you're
going for prints as the end product. Be aware that an
automated processor is NOT going to get good prints
from these images. An auto procesor will assume that
the print is, overall, 18% gray, so your white
background will come out gray. You're goingn to need
a decent photo lab to make good prints of these images.
=====
Bob Meyer
Life is uncertain. Eat dessert first.
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