Jia Ping. Focal Distance Output of Camera Zoom Lens and Accuracy Analysis[J]. Editorial Office of Optics and Precision Engineering, 1990,(2): 66-70DOI:
Zoom lens for measument televesion system is different from the ordinary. It is needed for a real-time output equipment of focal distance. In this paper
basic construction of zoom lens and principle of the focal distance output circuit are briefly described. We analyses mainly relations between the focal distance output and the measument accuracy
finding that the measument error distrabution at different focal distance varies with the convex wheel curve of zoom lens.