Autofocus speed graphic
Weight and gearing aside ,at onetime press cameras came with Kalart rangefinders .Later models had an attachment that fit onto the top of the rangefinder and drew power from the flash gun battery case. The unit projected a beam of light down through the mirrors and out into space. When you moved the lens bed the two beams converged and you were in focus . It was mainly for work in very dim light where normal viewing through the rangefinder was difficult. If one hooked up a small battery operated laser pointer instead of the light bulb used, it would project beams bright enough to use in daylight. Just a thought.


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