 Both models take ten 6×7cm exposures on 120 rollfilm, while the 670 model also accepts 220 rollfilm (20 exposures per roll).Model W67 is similar to the 670 model, but with a wide-angle Nikkor 55 mm lens (roughly equivalent to a 28 mm lens in 135 format).The 55 mm was considered one of the sharpest and most flare-free of any produced during the analogue photography era.