Electronic autocollimator

The Mark III-45S camera testing instrument operates according to an autocollimation method specially developed by Möller-Wedel. It is characterized by high accuracy, a particularly large measuring range, convenient setting options and simple operation. The device can be used to check the flange focal distance, the distance setting of cine and photographic camera lenses, and the run-out of zoom lenses. The camera testing instrument can be used both for testing the adaptation of lenses directly to the camera and for similar testing of the flange focal distance of interchangeable lenses. The camera tester can be used to check the change in the image plane of zoom lenses (error in the curve progression of the control curve) very easily and quickly. In addition, the device can be used to check the setting of ground-glass and aerial viewfinders. The free aperture of the camera tester is 45 mm. The device is suitable for testing camera lenses with focal lengths between 6 mm and 300 mm. With the standard autocollimation method for testing the adaptation of lenses the lens is adjusted so that the observer sees the image of a finely graduated test figure of an autocollimation telescope with identical sharpness to the eyepiece reticle of the autocollimator telescope. Alternatively, the color change method is used, in which a bright crosshair on a dark background is used instead of the finely divided test figure. The image of the crosshairs illuminated with white light in the eyepiece image plane of the autocollimation telescope shows color fringes if the objective is not correctly adjusted.