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业内人士中把底片为6×4.5cm的相机统称645,这种画幅的实际底片为42.0×55.1mm比例,这款相机无论专业人士或发烧友在使用中都有一种归属感,因为645机型轻便,美观又实用。在这类机型中有人们熟知的大品牌,如Mamiya(玛米亚),BRONICA(碧浪之家),PENTAX(潘太克斯),CONTAX(康太时)等。90年代中期,全自动款的AF型645也已面市,专家们用后好评如潮,6×4.5底片介于135及6×7底片之间,它比35mm片幅大2.7倍,这类底片的放大倍率远高于135,虽稍逊于6×7,但用于一
The industry in the film for the 6 × 4.5cm camera collectively 645, this format the actual film is 42.0 × 55.1mm ratio, this camera whether professional or enthusiast in use have a sense of belonging, because the 645 model is light , Beautiful and practical. Among these models are well-known big brands such as Mamiya, BRONICA, PENTAX, CONTAX and others. The mid-90s, automatic models of the AF 645 has also been available, the experts after the rave reviews, 6 × 4.5 film between 135 and 6 × 7 negatives, which is 2.7 times larger than the 35mm format, such films Magnification much higher than 135, although less than 6 × 7, but for one