Always readjust your focus to the infrared focusing mark when using infrared films and infrared.
当您使用红外线胶卷和红外线滤光器时，请您必须经常调整您的焦距至红外线对焦标记。
A focusing method by adjusting two slit mark images was proposed to realize accurate focusing of a non-mydriatic fundus camera for an observed retina image in dark.
为实现免散瞳眼底相机在被观测眼底图像较暗情况下的精确调焦，提出了双光楔裂像调焦方法。
A focusing method by adjusting two slit mark images was proposed to realize accurate focusing of a non-mydriatic fundus camera for an observed retina image in dark.
为实现免散瞳眼底相机在被观测眼底图像较暗情况下的精确调焦，提出了双光楔裂像调焦方法。
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