To get the "best" print you need 300 DPI. So (300 * 11.75) = 3525 pixels x
(16.5 * 300) = 4950 pixels. Which is 3525 * 4950 = 17,448,750 Pixels or
about 17.5 Megapixels.

There is not a digital SLR camera made today that has that much resolution.
That does not mean you can not get a good looking print on A3 paper. It just
means that you print at a lower DPI. Or interpolate the image bigger.

So the best compromise may be something like a Canon 5D Or Nikon D2X

Danny O'Byrne  http://www.digitalartzone.co.uk/

"All the technique in the world doesn't compensate for the inability to notice" Eliott Erwitt