The Studio Varotal V and Outdoor Varotal III are variable focal length lenses designed to cover the full range of focal lengths normally used for television programming. By eliminating the need to switch to a second camera for change of lens turret position, the Varotals provide means of producing a variation of close-u p and distance "shots" with only one camera. The lenses enable observation of detailed processes without the loss of continuity entailed in changing lenses. In addition, dramatic effects may be obtained by "zooming" from a distance shot to a close-up of one portion of the scene, or from a close-up view to a distance shot.

The Outdoor Varotal III Lens has been designed for versatile use in studios or on remotes. It features a unique dual range change from 4 to 20 inches and from 8 to 40 inches by means of a small lever on the lens without change of rear element or

loss of picture focus. High quality definition is achieved and the lens is fully color corrected and designed for use on both color or monochrome cameras. Minimum object distance for which the entire zoom range is available is twelve feet, and a close-up adaptor is available for reducing the minimum object distance to six feet.

Focus control is provided by rotation of a knob mounted an the zoom control lever. The direction of rotation of the focus knob, with respect to focusing action, corresponds to that of the regular camera focus knob, for ease and familiarity of operation.

An adjustable friction brake is provided to vary the amount of pressure required to operate the zoom control in accordance with individual operator preference. This brake may also be used to lock the zoom control at any desired point within the zoom range.

The separate zoom and focus control of the lens are mechanically coupled to the lens by two separate flexible cables. The zoom mechanism is mounted on a bracket at the right rear of the camera, and a lever on this control adjusts the focal length of the lens. A knob is attached to this lever for adjustment of zoom friction and may be used to lock the iris at any point within the zoom range.

Three range extenders and a close-up adaptor are available as accessories for the Varotal V. The extenders change the range of the basic lens to 2.4 to 24 inches, f/6.0; 3.2 to 32 inches, f/8.0; and 4.8 to 48 inches, f/12.0. The close-up adaptor has a minimum object distance of three feet.

The Varotal III and V are mounted on the RCA TK-11, 31 and TK-l4 monochrome TV Cameras by means of a special mounting plate which is readily installed in place of the standard camera turret. Either lens may be mounted directly on the TK-60 camera turret. Control cables and a suitable mounting bracket for the zoom and focus control mechanism are supplied with the lens. Ordering information should specify the type of RCA camera on which the lens is to be mounted.