Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 81
ways composed of objects unequally dis-tant from the object-glass ; and the opera-tor is contented with substituting the surfaceof the plate clothed with the sensitivecoating in the place of the ground glasswhich has served to obtain the focus. The object-glass is never totally expos-ed ; in order… … OUR DAGUERREAN GALLERIES.—k. I. THE MEADE GALLERY, NEW YORK. 70 The Photographic Art-Journal. his cylinder is closed with a disk in whichan op-ping is made less than the surface ofthe object-glass ; this is its diaphragm. For portraits, it has become necessaryto employ object-glasses with a longer…
Photography · Art and photography
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