You know the really nice thing about 6X7? It will crop to 6X6 really easy! A lot easier than a 6X4.5! I shoot both the RB-67 and C330 and like them both. If I have a scene I envision looking good square I just crop it when printing. Yea I know you lose a few shots per roll but when I shoot my 6X7 I only shoot 9 because 10 don't fit in my negative holders.