. The book of photography; practical, theoretical and applied. 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,. Fig. Fig. 511. Figs. .)10 am
. The book of photography; practical, theoretical and applied. 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,. Fig. Fig. 511. Figs. .)10 ami .ill.—Beck-Steixheii, or a biplanat if at f The Beck Bi-planat, an excellent objective of this kind,which has a movable graduated ring onthe mount, allowing focussing to be donewithout consulting the ground glass, isillustrated by Fig. 508. The rectilineartype of lens would almost represent per-fection for all ordinarv work if it were
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