短語詞組短語Focal distance length 焦距長度Focal -Length 焦距focal l length 焦距;鏡頭焦距focal l length ratio 焦距比focal l length gauge 焦距計focal center length 光心高度focal aperture length calibration 焦距檢定focal -length extender [攝]變倍附加鏡頭focal aperture length 焦距 返回 focal length