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2 宾得4．5×6中片幅系列旭光学公司发表的宾得4．5 × 6中片幅首架机型是1984年推出的宾得645(见图4),该机拍摄的净画幅尺寸为56mm × 41．5mm。虽然宾得645面市时间远远晚于玛米亚M645(电子焦平面帘幕快门,手动曝光最高快门速度为1/500s)、M645-1000S(M645改进机型,最高快门速度提升到1/1000S,1976年面市)、M645J(M645-1000S简化机型),但却是后来者居上,宾得645是当时中片幅相机中自动化程度最高的相机。
2 Pentax 4.5 × 6 medium-format series Asahi Optical Company Pentax 4.5 × 6 medium format The first model is introduced in 1984, Pentax 645 (see Figure 4), the aircraft shot net size is 56mm × 41.5mm. Although Pentax 645 time-to-market late in Mamiya M645 (electronic focal plane shutter, manual exposure maximum shutter speed of 1 / 500s), M645-1000S (M645 improved models, the maximum shutter speed to 1 / 1000S, 1976 market), M645J (M645-1000S simplified models), but it is later home, the Pentax 645 was the highest degree of automation in the medium-format camera.