Originally posted by ckiang
Try a Pro Lab. eg. Colour Lab, FotoHub, RGB, etc. The cheaper labs do not have the correct size paper.
There's no "Correct" dimensions. Popular sizes are 24mm x 65mm (X-Pan), 6x9, 6x12, 6x17, and whatever size the Noblex and Widelux is. Note, these are film cameras though.
Regards
CK