The lens is a Bausch and Lomb 50mm  Zeiss Tessar patented July 3, 1903. It is an F:3.5 to 22. The iris is smooth and working correctly. The glass is good and clear with some surface rubbing marks. Not much at all considering it is nearly a one hundred year old lens and camera. There is no lens fungus.

No other camera manufacturer had this guide on their camera. It's a wonderful look at the ability of this camera and gives the operator very useful information. This tag will allow the camera operator to instantly see what F-stop to put in when shooting a frame rate other than the standard 16 frames per second, (FPS). It also tells the operator what F-stop to put in when the shutter angle is not the standard 180 degrees. Thus one could shoot at 8 FPS and a 90 degree shutter and go over to this graph and instantly deduce the combination into the correct F-stop to arrive at the proper exposure for the film stock on hand.

Sterling's are very rare cameras. I know they are more rare than Lumiere cameras. I have seen many more Lumiere cameras than Sterlings. This camera seems to be factory modified compared to the one other Sterling camera I have seen. The normal Sterling camera box would only allow the use of 150 foot film loads. It is very difficult to shoot a feature on 150 foot loads so this camera was built to take 300 foot loads.