A Manual Of Photography

1852.] GRIFFIN’S SCIENTIFIC CIRCULAR. 101 2695 Photographic Camera, ^. 2686 a, so constructed as to be employed for the Daguerreotype, ’filetype and Collodion body to adapt it to lenses of different foci ; focusing glass in tram, frames for holding the prepared Calotype paper three fiâmes for holding the glass plates, No. 2783, 2784 and 2785, for use in the Collodion Process, and the plates 2780, 2781 and 2782, in åeVer Oo- type Process, fitted with achromatic lens 21 ^es in diameter mounted in brass with rack and pinion adjustment, No. 2/02, capable of producing pictures 10 inches by 8 inches, 5A 5s. 2696 The same Camera, with the double combination of achromatic lenses, No. 2705, 11/. 15s. SINGLE ACHROMATIC LENSES. These lenses are weil adapted for the plate - -^ double’combination oLcheomatio Lenses must he employed. 2697. Single Achromatic Lens, 1Iinch in diameter, 7-inch focus. Price 9s. . . , 2698. Ditto, mounted in brass, with rack and pinion ad- justment. Price 1/. 5s. 2699. Single Achromatic Lens, 2| inches in diameter, 1O-inch focus. Price 14s. , . 2700. Ditto, mounted in brass, with rack and pinion a< - justment. Price 1/. 17s. 6d. 2701. Single Achromatic Lens, 2^ inches in diameter, 14-inch focus. Price 11. . , 2702. Ditto, mounted in brass, with rack and pinion adjustment. I rice 2/. 10s. DOUBLE COMBINATION OF ACHROMATIC LENSES. The Double Lenses are adapted for taking portraits, figures, groups Lc as they admit a great quantity of light, and consequently produce a picture in less time than a g lens. 2703. A Double Combination of Achromatic Lenses, 1’7 inches in‘diameter about 4 inches, mounted in brass, with 2704. 2705 having a combined focus of rack and pinion adjustment, producing a picture 4| inches by 3| inches. Price 2/. A Double Combination of Achromatic Lenses, 2’4 in. in diameter, having a com- bined focus of about 7 inches, mounted in brass, with rack and pinion adjustment, pro- ducing a picture 6K inches by 4ê inches. Price 3/. 10s. A Double Combination of Achromatic Lenses, 32 inches in diameter, having a combined focus of about 10 inches, mounted in brass, with rack and pinion adjustment, producing a picture 8* inches by 6g inches. Price 9/ 9706 A Diaphragm of stops fitted to either of the above sets of Lenses, 15s. The use of this Diaphragm is given in the explanatory note at page 08. The focus of the Combination is measured from the back lens to the ground-glass, the image being received from some distant object.