. The book of photography; practical, theoretical and applied. 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,
. The book of photography; practical, theoretical and applied. 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 Fig. 5u8.—Beck Biplanat. Hectilixear Lexses. The lapid rectilinear group includes,besides the various oVjjectives of thatname, those known as rapid sjmmetrical,«uryscope, aplanat, biplanat, periplanat, linear. The Dallmej-er wide-angle recti-linear, which works at the comparativelylarge aperture of //16, is shown by A rectilinear of large aperture, sayf 4 or f,, is admirably adapted forportraiture ; such a lens is known as anextra-rapid rectilinear if working at fj-i,
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