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Technology Stocks : The *NEW* Frank Coluccio Technology Forum -- Ignore unavailable to you. Want to Upgrade?

To: ahhaha who wrote (18901)	1/13/2007 2:59:20 PM
From: Frank A. Coluccio	Read Replies (2) \| Respond to of 46821

"In theory, a variable focal point lens is possible. I know they do exist in a primitive form where focal length is a function of vertical lens height. All one does is tilt one's head up depending on the nearness of the target." Speaking of 'targets'... I once taught the operating principles behind an airborne analog computer system whose functions included controlling the operation of photographic aerial reconnaissance equipment aboard low-altitude, low-velocity aircraft. The focal point and the speed of the film traveling across the camera's platen (image motion compensation to prevent blurring), were determined on a near-instantaneous basis at any point in flight by the output of a magnetic amplifier whose inputs included the aircraft's velocity * height * a constant * the delta in voltage readings from images passing through an optical grating subsystem. This assemblage weighed about two hundred pounds and fit snuggly into the belly of the fuselage of this Grumman OV-1A Mohawk (photo below), which we affectionately referred to as "the grasshopper", for obvious reasons: fas.org