. The book of photography; practical, theoretical and applied. Fig. .506.—Sectiox of Wide-axgle Rectilixeak Lexs- that, by a screw arrangement for slightlyincreasing the separation between thecombinations, the amount of diffusion offocus may be altered at will; so that thephotographer may secure either criticalsharpness in one plane only or a morediffused definition over several are also now made to work atuuich larger apertures than was at one-. Fig. .507.—Dallmeyer Wide-axole RectilixeakLens. time considered possible ; as, for instance,,in the portrait lens of Voigtlander (Fig.
. The book of photography; practical, theoretical and applied. Fig. .506.—Sectiox of Wide-axgle Rectilixeak Lexs- that, by a screw arrangement for slightlyincreasing the separation between thecombinations, the amount of diffusion offocus may be altered at will; so that thephotographer may secure either criticalsharpness in one plane only or a morediffused definition over several are also now made to work atuuich larger apertures than was at one-. Fig. .507.—Dallmeyer Wide-axole RectilixeakLens. time considered possible ; as, for instance,,in the portrait lens of Voigtlander (), which works at The Cookeportrait lens (Fig. 504) consists of threesimple glasses only, and, as will be seen,allows of adjustment between its com-ponents, to secure different effects. TheI)allmeyer-Bergheim lens is a favouritewith workers of the impressionist consists of two uncorrected single 3fJ6 THE BOOK OF PHOTOGRAPHY. lenses, of negative and positive curvaturerespectively, and introduces a pleasingamount of diffusion of focus. The separa-tion is adjustable, so that the focal lengthmay be varied.
Size: 1271px × 1967px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
