OF PHOTOGRAPHIC APPARATUS. 



135 



1616. No. 1. Cabinet lens, 2 -inch, clear aperture, 6-inch, focus ; should be placed at 



14 feet from the sitter . . . . . 13 



1617. No. 2. CABINET LENS, 3J-inch. clear aperture, 8-inch, focus ; should be placed at 



18 feet from the sitter. . . . . . " 17 10 



1618. No. 3. CABINET LENS, 3i-inch. clear aperture, 10-inch, focus ; should be placed at 



20 feet from the sitter 19 10 



NEW ACTINIC DOUBLET LENSES, 



FOE LANDSCAPES, AECHITECTUEAL SUBJECTS, ENLABGING, AND COPYING. 



1619. Ordinary Doublets. Angle subtended by diagonal of plate, about 74 ; ditto by 

 horizontal base line, about 60. 



* These sizes are made only to order. 



t The prices in this column refer to a lengthening tube, which must be screwed on between 

 the front combination and the diaphragms when the lens is used as a single combination. For 

 architectural subjects, when the camera requires tilting, the single lens should be used in front 

 of the diaphragm plate ; at other times behind. 



1620. NEW SERIES OF DOUBLETS, 



DESIGNATED "SMALL-ANGLE," 



Giving the same amount of subject as the ordinary single combination landscape lens. * 

 Angle subtended by diagonal of plate, about 46 ; ditto by horizontal base line 

 about 37. 



* This lens is suitable for instantaneous stereoscopic marine views. 

 LAEGEB SIZES MADE TO OEDEB. 



