Panoramic Camera
This scanning camera uses a continuously rotating folded optical system, often called an optical bar, common in modern panoramic cameras for compact long-focal-length, wide-angle scanning. Precise synchronization of optics/film became feasible through precision electro-optical encoders controlling optical/mechanical functions. The folded assembly rotates around an axis while film lies on a rotating-drum cover and travels oppositely, maintaining matched image/film speed. This avoids high film acceleration/speed and keeps the lens uniformly heated. Registration is needed only across the scanning slit. A positive-contact friction-gear system driven directly by the optical bar provides synchronization. As lens-to-image distance (drum-cover radius) differs from focal length, lateral image shift occurs; opposite film motion during exposure compensates. Film speed may vary as a function of altitude. Compactness enables convergent stereo photography by tilting optics/drum alternately forward/back before exposures. Rotating them around pitch during exposure compensates forward motion; adjustable pitch rate corrects aircraft-motion blur during panoramic scans.
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