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1.镜头在购买相机时可打开 B 门观察镜头。镜头内应干净、无金属屑等杂物,表面清洁无污渍、划伤、崩边等,镜头不能发霉、脱胶或有明显的气泡等,调节光圈环时,光圈环与光栏叶片的联动应平滑可靠、换档明显、光圈形状应基本均匀。光栏叶片表面无锈斑、无油渍。转动调焦环时,应平稳、舒适。卡口连接应保证镜头能方便和轻松地装卸。2.快门挑选照相机时,选择快门各档速度,快门释放时间应有差别,主要检查1秒、1/125秒和1/1000秒的速度情况,在高速档时可通过看光亮的方法来判断,速度越快,通过镜头的光线就越少。
1 lens in the purchase of the camera can open the B door observation lens. The lens should be clean, no metal debris and other debris, the surface clean and no stains, scratches, chipping, etc., the lens can not mold, degumming or obvious bubbles, etc., adjust the aperture ring, the aperture ring and the light bar leaves should be smooth linkage Reliable, shift obviously, the aperture shape should be basically uniform. Light bar blade surface no rust, no grease. Turn the focus ring should be smooth and comfortable. Bayonet connections should ensure that the lens can be easily and easily handled. 2. Shutter Select the camera, select the shutter speed, shutter release time should be different, the main check 1 second, 1/125 seconds and 1/1000 seconds of speed, high gear can be judged by the way to see the light The faster you pass, the less light you pass through the lens.