Wide angle Pantoskop N° 5 lens. Optical design by Emil BUSCH - Roja-Rathenow - uses 2 symmetrical lenses, separately achromatic, with short radius of curvature. The outer elements are crown glass and the inner ones are flint glass. Focal length 242 mm. Claimed to cover 353 x 524 mm. (sic Traité Encyclopédique de Photographie de Fabre 1887).
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