lens focal length meaning in English

透镜焦距

Stores photographic data of up to 7 rolls of 36 exposures on aperture , lens focal length , exposure compensation exposure bracketing increments , shutter speed , flash compensation flash bracketing increments ( including flash on off status ) , exposure mode , and metering mode
可以储存7卷36格菲林的光圈、镜头焦距、曝光补偿包围式曝光增减值、快门速度、闪灯补偿包围式闪灯增减值(包括：闪灯开启开关状态) 、曝光模式及测光模式等拍摄资料
( 3 ) properties of yag laser q - switching by sbs were experimentally investigated , and the laser without back reflective mirror was devised , and laser pulse was obtained at repetition rate ihz and 5hz by optimizing lens focal length , length of cell and position of lens focal . point , resulting quality of pc is ideal
( 4 ) 、实验研究了sbs的yag激光器，设计了无后向反射镜的sbsyag激光器。在泵浦能量17j 、重复频率分别为1hz 、 5hz时，得到稳定输出的能量为19mj 、脉宽为10 . 7ns 、光束质量很好的激光脉冲。