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。

Always readjust your focus to the infrared focusing mark when using infrared films and infrared.

youdao

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。

Always readjust your focus to the infrared focusing mark when using infrared films and infrared.

youdao