Canon TV-16 25-100 mm Zoom Lens 1.8-22f 2.5-50m with case from the estate of an avid amateur photographer and college professor. I have not used it and have not tested it, so sold as is, not subject to return. Please read description and check out the photos regarding the condition of the item. The lens does not appear to have any imperfections based on looking through it toward a light source and does not have any surface scratches or marks on the lens. The barrel of the lens has the name of the previous owner scratched onto it. The case is in good working order but also has the name of the previous owner scratched onto it. See photos.  Free pickup in Mercer County, NJ.

I do not have the camera that went with this lens so I am not sure which camera it was used for. It is likely that it was originally purchased for an 8mm or 16mm movie camera like a Bolex which the previous owner also had. These lenses are also used for various CCD cameras, CCTV or VTR cameras, and adapts to Micro 4/3 cameras. 

A C mount is a type of lens mount commonly found on 16mm movie cameras, closed-circuit television cameras, machine vision cameras and microscope phototubes. 

C-mount lenses provide a male thread which mates with a female thread on the camera. The thread is nominally 1.000 inch (25.4 mm) in diameter, with 32 threads per inch, designated as "1-32 UN 2A" in the ANSI B1.1 standard for unified screw threads. The flange focal distance is 17.526 millimeters (0.6900 in) for a C mount. 

Merely to say that a lens is "C-mount" says very little about the lens' intended use. C-mount lenses have been made for many different formats, the largest being 4 times as large as the smallest. C-mount lenses are built for the 8mm and 16mm film formats and the 1/3, 1/2, 2/3, and 1-inch video formats, which corresponds to a range of image circles from 5 to 17 mm diameter, approximately. Some manufacturers have recently introduced lenses for the 4/3 inch / 1.3 inch format but these remain very expensive. 

This is no trivial difference. For example, for the 4/3 format, a 12-mm lens is a wide-angle lens and will have a retro focus design. For the 2/3 inch format, a 12mm lens is "normal" and can have a simple and fast double Gauss layout. For the 1/3 inch format, a 12-mm lens is long and can have a telephoto design.

Unlike the lens offered in this auction, which allows control of aperture and distance, some TV lenses lack provision to focus or vary the aperture, so may not operate properly with film cameras. Also, some TV lenses may have bits that protrude behind the mount far enough to interfere with the shutter or reflex finder mechanisms of a film camera. 

Although C-mount lenses have a back focal distance far too short to be used with 35mm film SLRs or any existing digital SLR, they can be mounted on interchangeable-lens mirrorless digital cameras. One such system is the Micro Four Thirds, being used by Olympus and Panasonic. However, the vast majority of C-mount lenses produce an image circle too small to effectively cover the entire (micro-)four-thirds sensor, with its approximately 22-mm diagonal. This produces what is popularly called vignetting but is better described as a mismatch between camera format and lens format. 

The letter "C" is said to stand for "cine", the original application being movie camera lenses. (Wikipedia)

If you have any questions please email, I will get back to you ASAP. Please see my other auctions! So you can bid with confidence, here is a little information about me. My books and photos are stored in a climate controlled, smoke free environment. I specialize in photography books, and have both bought and sold on ebay for several years. About 20 years ago, I established a web site called Saretzky Online through which I share some of my photos, and provide both information about the history of photography and a changing list of about 800 out of print and recent photo books. (Ebay doesn’t let me tell you the address of the site but you can find it if you use a popular search engine that sounds something like “gurgle.” To date, I have never had a negative ebay feedback rating and I hope to keep it that way! To prevent damage during shipping, all items are wrapped using protective packaging. Thank you for bidding!