26 OPTICAL AND PHOTOGRAPHIC APPARATUS AND DEVICES-NAMELY, PHOTOGRAPHIC AND MOTION-PICTURE OBJECTIVES, VARIFOCAL OBJECTIVES AND ATTACHMENTS, ENLARGEMENT AND PROJECTION OBJECTIVES, TELESCOPES AND BINOCULARS AND LENSES THEREFOR, LENS ATTACHMENTS, OPTICAL FILTERS, VIEW FINDERS, RANGE FINDERS, LOUPES, AND MAGNIFYING DEVICES