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1956年,东德的KW公司推出了Praktica FX2型135单镜头反光照相机(图1),该照相机(后期版,下同)机身上设计了一个非快门同步顶针式光圈自动收放结构,即光圈的收缩与弹开不与快门速度同步,只受快门释放按钮的控制,无论快门上弦与否,按下快门释放按钮,光圈即自动收缩,手指抬起,光圈自动弹开,呈全开状态,便于取景、对焦。
In 1956, the KW company in East Germany introduced the Praktica FX2 135 single-lens reflex camera (Figure 1). The camera (later version, the same below) was designed with a non-shutter synchronized ejector aperture automatic retractable structure Aperture contraction and bounce is not synchronized with the shutter speed, only by the shutter release button control, regardless of shutter or not, press the shutter release button, the aperture that automatically shrink, lift your fingers, the aperture automatically bounced, was fully open state , Easy to framing, focusing.