I've got a quick question on print sizes, nothing technical though. My cameras are 10mp each producing images of 3872 x 2592 pixels. This is perfect for A3 printing (got a print done today) and i'm assuming that's the maximum size i can print without actually 'upscaling' (or whatever the proper term is).. My question is can i print larger than this without the print looking less than ideal? if so, what's a recommended maximum size and what's the best way to upscale it? Thanks - and i'm sorry if this has been asked before.