拍品专文
This lens was the subject of British Patent no. 656011.
细节
ROSS, London
A Wide Angle Survey 6.3 inch 16cm. f/5.5 lens no. 9698 with integral yellow filter, in a chrome mount.
A Wide Angle Survey 6.3 inch 16cm. f/5.5 lens no. 9698 with integral yellow filter, in a chrome mount.