Catalogue of printed matter and photographic materials : June, 1887 (1887)
Percy Lund & Co · Bradford : The Country Press · leaf 50
upon the relative size of plate to the focus of the lens ; thus a 6-inch lens on a 6 inch plate gives an angle of 53 degs., but the same lens on a 12 -inch plate will embrace an angle of 90 degs. These lenses will, with a small stop (not necessarily the smallest), work well up to 90 degs., and in… … Full size. D to G. would have otherwise sufficed to cover the plate sharply. Note. — The back lens may be used as a single of about twice the focus. PRICES OF WIDE ANGLE RECTILINEAR LENSES. Price. Focus. Small. Medium. Large Stop. 0 34 ins. £2 10 *A 5x4 3x3 4x3 0 2 15 64 .. 5 5 4| „ *B 4 „ 3 ,, 4 0…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
