Abstract: A color television camera has an optical color separation system provided in an optical path for scene light so as to produce pictures of different colors on pickup areas of pickup elements. The scene light extends along optical axes in the system which are central axes of the pickup areas. To synchronize picture signals so that picture coverage is optimized on the joint display thereof, the camera comprises a test image projector and an adjusting circuit. So as to obtain a compact optical system without using a movable reflecting surface for the test image, which surface would be moved in and out of the optical path, the light of the test image is projected at an oblique angle with respect to the optical axes into the color separation system and strikes the pickup areas at an oblique angle. Optical imaging errors produced thereby are precompensated. Optical precompensation means are provided in the form of an obliquely arranged test image slide and a cylindrical plano-convex correction lens.

Abstract: In a television camera having at least one pickup tube, it is desirable to generate an electron beam with a current intensity which is greater than that necessary for obtaining a picture signal with a nominal amplitude between a black level and a white value. This prevents comet tails from being produced on the display behind brighter, moving scene portions. The electron beam intensity is adjusted by blanking the electron beam periodically during at least one field period and within the field period during at least a portion of a line period of a number of consecutive lines. The electron beam is properly set when the picture signal amplitude is observed to be maximum at a substantially minimum beam current intensity.

Abstract: A television camera adjustment by means of a monitor picture is effected by forming a window area therein by means of which the camera operator directs the camera to a scene, the window area lines being used as an indication that an optimal adjustment has been achieved or as an indication for the operator that he must perform an adjustment procedure into one or into the other direction because it is not possible to obtain the optimal situation by means of surpassing a control range. With a color television camera the procedure can be used for a white balance adjustment combined in an advantageous manner with a black level adjustment.