. The book of photography; practical, theoretical and applied. 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. Fig. .509-—UXSYMMETUICAL and other distinctive titles, besides thewide-angle variety. The usual form ofrapid rectilinear (Fig. 5
. The book of photography; practical, theoretical and applied. 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. Fig. .509-—UXSYMMETUICAL and other distinctive titles, besides thewide-angle variety. The usual form ofrapid rectilinear (Fig. 505) is symmetrical,consisting of two similar combinations,with the diaphragm between. As itsname indicates, it overcomes distortion,and gives also a large aperture com-bined with flatness of field. The wide-angle rectilinear (Fig. 506) has a smaller?iiperture, and the combinations are placedcloser together, being, it will be noticed,also larger in proportion to the size of theaperture than those of the ordinary recti-
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphotography, bookyear
