45, COENHILL, E.G., AND 122, REGENT STREET, \V., LONDON. 



521 



3164 



SERIES No. IV. 

 LANDSCAPE APLANATS. 



(Angle about 75). 



This class of Aplanatic Lens is specially constructed for Landscape work, but 

 can also be advantageously used for copying ; effective aperture T V TT ; the field 

 is even greater than in the Aplanats of Series III., so that with equal size of plate 

 and corresponding number of Aplanat, subjects are obtained of sharp definition in 

 the margin, which are not perceptible with lenses of Series III. 



In Landscape work it is frequently desirable to take the same subject in various 

 size pictures from the same spot, and this is only attainable by the employment of 

 objectives of different foci. For this work we have arranged a number of objectives 

 in "sets," for which purpose the lenses of Series IV., owing to their closeness to 

 one another, are most suitable. All the lenses of these sets fit into the same flange 

 by means of a bayonet hinge, and each set is provided with a combination of five 

 diaphragms or stops. 



Set of four Landscape Aplanats, each of the same aperture of lens, 15-16in. (23 

 millimetres), but varying foci, say 9|, 12f, 15f, 19 inches (24, 30, 40, and 48 

 centimetres) in lock-up case; size of picture with full aperture, 6^f by 5| inches 

 (17'5 x 13'8 centimetres), with smallest diaphragm, 11 X 7 inches (28 X 20 

 centimetres.) Price 20. 



Note. Sets of any number and class of Aplanats made to order at proportionat 6 

 pric es . 



SERIES No. Y. 



3165 WIDE-ANGLE APLANATS FOR INTERIORS, ARCHITECTURE JH 



AND LANDSCAPES. 



Effective Aperture ^ ? of their foci. 



The proportionately short focus and the large angle (about 100) of these lenses 

 make them particularly adapted for interior work and for very high broad objects 

 taken from short distances. 



By reducing the amount of light, an increase of " Sharpness," depth and angle 

 of field is obtained. 



