134 L. CASELLA'S CATALOGUE 



1600. No, 2 A. Portrait Lens, the lenses 2i-inch. diameter and 7^-inch. focal length, for 



pictures on plates 5 by 4 inch, and under. This lens produces larger portraits 

 than the above ...... 10 10 



1601. A SET OF WATEEHOUSE DIAPHEAGMS, in morocco case, for ditto 150 



1602. No. 3. POETEAIT LENS, the lenses 3i-inch. diameter and 10-inch focal length, 



for pictures on plates 6 by 5 inch, and under . . 16 



1603. A SET OF WATEEHOUSE DIAPHEAGMS, in morocco case, for ditto 1 10 



1604. No 3A. POETEAIT LENS, the front lens 3i-inch. diameter, the back lens 4-inch. 



diameter, 12-inch, focal length, for pictures on plates 8^ by 6^-inch., and 

 under ... ... 25 



1605. A SET OF WATEEHOUSE DIAPHEAGMS, in morocco case, for ditto 1 15 



1606. Portrait LeilS, the lenses 4^-inch. diameter, 15 inches focal length, for pictures 



on plates 10 by 8 inches and under .... 36 



1606*. A SET OF WATEEHOUSE DIAPHEAGMS, in morocco case, for ditto 200 



1607. PORTEAIT LENS, the front lens 3j inches diameter, the back lens 5 inches dia- 



meter, 20 inches focal length, for pictures on plates 16 by 14 inches and under 



30 

 1607*. A SET OF WATEEHOUSE DIAPHEAGMS, in morocco case, for ditto 250 



QUICK-ACTING C A RT E-D E-V I S ITE LENSES, 



WITH WATEEHOUSE DIAPHEAGMS AND BACK AND PINION MOVEMENT. 



1608. No. 1. Carte-de-Visite LeilS, consisting of two actinic combinations, IJ-inch. 



diameter, 4^ -inches focal length, ; requires from 13 to 14 feet between the 

 subject and the focussing screen of camera . - . . * 5 15 



1609. No. 2. CAETE-DE-VISITE LENS, 2 T \ r inch. diameter, 4f -inch, focal length ; requires 



from 15 to 16 feet between the subject and focussing screen of camera 6 10 



1610. No. 3. CAETE-DE-VISITE LENS, 2i-inch. diameter, 6-inch, focal length ; requires 



from 19 to 20 feet between the subject and focussing screen of camera 11 10 



1611. No. 3 A. CAETE-DE-VISITE LENS (extra rapid), 3^-inch. diameter, 6-inch, focal 



length ; requires the same working space as No. 3, and may be used with full 



aperture for large vignettes of children . . . 25 



The following table, showing the greatest distance required between the subject and the 



focussing screen, to produce figures 2| inch, and 3 inch, with each of the lenses (the standard 



being 6 feet), is given as a guide to photographers in their selection of a lens suitable for the 



length of their operating rooms : 



For 2^ inch. For 3 inch. 



No. 1. CAETE-DE-VISITE LENS -. 14 feet. 13 feet. 



No. 2. CAETE-DE-VISITE LENS *' 16 feet. 14f feet. 



No. 3. CAETE-DE-VISITE LENS ., 20 feet. 18| feet. 



No. 3A. CAETE-DE-VISITE LENS . . 20 feet. 18f feet. 



*#* In order that the whole image may be in focus, the camera should be placed level and 

 midway of the subject, or thereabouts ; however, some little latitude may be allowed, and the 

 camera placed somewhat higher, when it will require tilting a little. But if the camera be put 

 at an elevation of about five feet, it must be tilted considerably, and a swing back to the camera 

 will be indispensable to get the picture all in focus. 



LENSES FOR CABINET PORTRAITS. 



These lenses have a flat field, and give remarkably brilliant pictures. They have 

 Waterhouse diaphragms and rack and pinion movement. . f \ .*' 



