American Optical 6.3/12" Wide-Angle
Topogon-style large format ultra wide angle lens, focal length 12" (304mm), covering 18"x18" large format, made in very small quantity for aerial photography, technical specification from the included sheet: Lens: 12 Inch s/6.3 Catalog number: 51-90-21-002 Equivalent focal length: 304.8 +- 6.0mm Back focal distance: 240.5+-6.0mm Telephoto ratio: 0.88 Front operating aperture: 166.5mm Rear operating aperture: 168.4mm Film size covered: 9x18 inches One half angular coverage 40.0° Front clearance angle: 40.5° max. Rear clearance angle: 37.5° max. Applicable military specification: MIL-L-7236A Number of lens elements: 5 including vignetting correction filter, the lens is in like new condition, both front and rear elements have original caps, two filters (red and yellow), maker's box
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