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前几期我们向大家介绍了如何选购一台好的照相机,相机选好了,用什么样的胶卷好呢?下面我们做个简单的介绍。 什么是胶卷的感光度?不同感光度的胶卷性能有何差异? 感光度是表示感光片对光线感应能力快慢的标志。感光度高的感光片,对光线的反应十分敏感,即使在光线微弱的照明条件下仍可以拍摄,这种感光度高的胶卷,我们通常称它为“快速胶卷”。而感光度低的感光片,对光线反应较迟钝,必须在光线充足的条件下才能拍摄,这种胶卷称为“慢速胶卷”。由此可见,拍摄前先要了解所用胶卷的感光度,并把照相机感光度表盘调到所使用胶卷感光度的读数上(这一操作对内测光的照相机尤为重要),这样,拍摄时才能对曝光的准确性做到心中有数(在高档全自动相机中,相机一般能够自动识别所用胶卷的感光度,拍摄者不必自调)。
A few days ago we introduced how to buy a good camera, the camera selected, with what kind of film is good? Here we make a brief introduction. What is the sensitivity of the film? Different sensitivity of film performance What is the difference? Sensitivity is the sensitivity of light-sensitive film that the speed of signs. Sensitive to light sensitive film, the response to light is very sensitive, even in low light lighting conditions can still shoot, this high sensitivity film, we often call it “fast film.” The sensitivity of the photosensitive film, the response to light relatively slow, it must be sufficient conditions to shoot under light, this film is called “slow film.” This shows that it is important to understand the sensitivity of the film used and to adjust the camera sensitivity dial to the sensitivity of the film being used (this is especially important for in-camera metering cameras) prior to filming Be aware of the accuracy of the exposure (in high-end fully automatic cameras, the camera normally recognizes the sensitivity of the film used, and the photographer does not have to adjust).