Ross Doublet Camera Lens

Doublet camera lens, manufactured by Ross. Consists of two convex lenses housed at either end of a cylindrical copper alloy tube. Tube has a rectangular opening through which filters can be inserted between the two lenses. On the reverse of body tube is a section of ratcheting where rack work can be attached. A collar sits around the body tube, the collar has two square sections removed allowing for access to rectangular opening and ratcheting on body tube. The manufacturer's name is also engraved on the collar.