Telecentric lensvs normallens

The Telecentric is an early telephoto lens made by Ross of London. It was designed by William Bielicke[1] and introduced around 1912[2] and was sold until 1922.[3] It was replaced with the Teleros soon after this, however.[1]

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The Telecentric was made in lengths of 9, 11, 12, 13 and 17 inches, and in maximum apertures f/5.4 and f/6.8. Both of these have the same back focus, which is half the focal length. As can be seen in the illustration, the lens comprises five glass elements in two groups. In his lecture to the RPS, Clay[1] referred to the Telecentric in connection to the use of cemented groups of glasses of different refractive indices, saying that then fairly new types of glass available from Schott in Jena allowed improved correction of aberrations.

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Clay mentioned the short back-focus of the Telecentric relative to its focal length, and the usefulness of this particularly on reflex cameras, which have limited bellows extension. Early Photography[4] shows a reflex camera of 1914, a quarter-plate N&S Patent Reflex, with an 11 inch f/6.8 Telecentric in two parts, which fitted to the front and back of a front shutter. The standard lens for the camera is mounted on a shortened thread, for quick changing between lenses, and the lens shade-flap can also be quickly exchanged for a bellows hood to serve the telephoto. When not in use, the telephoto lens was stored in a compartment in the camera. Before the Telecentric was available, this camera was supplied with a Busch Bis-Telar, from 1911.

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Telecentric has come to mean something very specific in optics[6]; telecentric lenses are used in machine vision and measuring applications, but are not of much interest in general photography. The Telecentric is not a telecentric lens.