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1954年,日本旭·光学公司(即后来的PENTAX)推出了AshiflexⅡB型非五棱镜取景式单镜头反光照相机(图1),该照相机与前期发表的IA型外形上几乎一致,区别仅在于闪光连线插孔,IA型插孔为单极古典式(图2),ⅡB型插孔为双极现代式(图3),此款式不仅可使用古典式一次性闪光装置,还可使用现代闪光灯。其中ⅡB-I型后期版相机的最大创新是快门同步即时返回式反光镜,即:快门未上弦时,按动快门释放按钮毫无作用(不同于前述Praktiflex),只有当快门上弦、卷片后按动快门释放按钮,在快门动作结束的同时,反光镜才随即自动快速下落复位,不必考
In 1954, Asahi Optical Co., Ltd. (later PENTAX) introduced the Ashiflex IIB non-pentaprism viewfinder single lens reflex camera (Figure 1). The camera was almost the same as the IA model previously published, except that the flash Line jack, IA jack for the monopolar classic (Figure 2), IIB jack for the bipolar modern (Figure 3), this style can not only use the classic disposable flash device, you can also use the modern flash. One ⅡB-I later version of the camera’s biggest innovation is the shutter synchronization instant return mirror, that is: the shutter is not winding, press the shutter release button has no effect (unlike the Praktiflex), only when the shutter winding, winding after Press the shutter release button, the shutter movement at the end of the same time, the mirror will immediately fall quickly reset, do not have to test