National Geographic : 1911 Jun
The Nine-Foot Photographic Supplement To This Magazine Was Taken With A Bausck Lom eiss Convertible protar Often you find you can get a satisfactory photograph of a landscape from but one viewpoint. With a Convertible Protar you can choose your angle of view and size of image without changing your viewpoint, because this lens is composed of two perfectly corrected single anas tigmats, and hence is virtually three-lenses-in-one. The Bausck LomISS Protar (cvna) ens is by far the most advantageous lens for general outdoor work; for, in addition to its providing lenses of three different foci, the doublet of moderate focal length is more than twice as fast as the ordinary camera lens, and hence unexcelled for groups and portraits. The single long focus lenses are available for wide angle work, and are unequalled for showing details of geological structure, for inaccessible birds' nests, for game at a distance which it would be impossible'to photograph at close range, for speci mens and flowers in the field, or for distant mountains. Proof of the estimation in which Protar is held is evidenced by the men using it-the most expert and experienced pho tographers. Let us send you a set of sample prints showing what the lens actually does. SOur name, backed by over half a century of ~ s experience, is on all our products-lenses, mi croscopes, field glasses, projection apparatus, engineering and other scientific instruments. Bausch & Lomb Optical Co NEW YORK WASHINGTON CHICAGO SAN FRANCISCO LONDON ROCHESTER,.N.Y. TRANKFORT "Mention the Geographic-It identifies you."