什么是Vari Focal Zoom Camera

什么是Vari Focal Zoom Camera instruction manual for direct drive iris fixed focal vari fo Vari zoom focal distan Scroll the mouse wheel to zoom the camera in and out是什么意思? scroll the mous wheel to zoom the camera in and out是什么意思? camera focal length的意思 “zoom”和“zoom Shared Focal Point authority Joint Focal Point authority 有啥区 vari 的发音音标是什么?