Camera setting indicating system - uses three sets of LED's sequentially illuminated by microprocessor, within viewfinder to indicate lens settings to operator

摘要

The cine camera has an interchangeable objective lens focussing an image on to a film behind a window. A rotary or alternating shutter controls the division of light between the film and the viewfinder. In the viewfinder, in addition to the image there are three linear scales. These are used to indicate the setting of the aperture, the focus distance, and the focal length of the lens being used. Each lens may consist of a series of light emitting diodes. One or several of each set of lights are illuminated at a particular time to indicate the relevant setting. A microprocessor receives input signals from sensors associated with the camera lens, and when initially set up, is programmed with information from a keypad. This enables the microprocessor to control the LED displays shown within the viewfinder.