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1938年,著名的德国KW公司(KAMERA WERKSTTTEN)推出了PRAKTIFLEX I型照相机(图1),该相机相比EXAKTA相机最大的创新在于非快门同步即时返回式反光镜的设计(反光镜上下运动与快门不联动),即反光镜随手指下压或抬起,作上升或下落运动,只要手指抬起,反光镜就下落,当快门启闭后,便于再次取景,同时也可观察前一次照片拍摄的情况,譬如,被摄人物的神态及其动作是否满意,以决定是否需要重新拍摄,而不会像EXAKTA照相机那样,快门释放后,反光镜固定在上翻
In 1938, the famous KAMERA WERKSTTTEN introduced the PRAKTIFLEX I-type camera (Figure 1). The major innovation of this camera compared to the EXAKTA camera is the design of the non-shutter-synchronized instant return mirror (mirror movement up and down the shutter Not linked), that is, the mirror under the finger pressure or lift, ascending or falling movement, as long as the fingers raised, the mirror drops, when the shutter opening and closing, easy to view again, but also observe the previous photo shoot For example, whether the photographer’s demeanor and his movements are satisfactory in order to decide whether to re-shoot or not, unlike an EXAKTA camera, with the mirror fixed on the flip after the shutter has been released