Right I get everything you are saying however if I type in 4950 the number after it will automatically be less than that number... someone suggested this on poser and I kept getting images that were not whole (clipping occured) when i set to 300 dpi. I get amazing pictures when i do 9500 x 4000 ??ish that fit onto A3 quite well with a bit of photoshop shrinking but they take too long. Are the automated stettings such as 640x 480 or 1600x 1200 just simply square images and will not be good for A3.

what i am saying is if i can put the settings to 4950 x 7020 pixels and then 300 dpi I am pretty much certain the image will not render as it is on screen (this is the case in poser)

Thanks for all the settings will try these later.