The RB67 is 6x7 cm. There are several backs, the standard 6x7, the 6x4.5, and an automated back allowing 6x8 cm. You could just crop the 6x7 in the darkroom if you really wanted. I do occasionally, but like the option. It has rotating back, thus eliminating the need to rotate the camera. It is a very versatile camera. It is big, and requires muscles to use off tripod. I used it both in the studio, and the field. I love it.