Series IX, f/10, f/12, f/16 is an Apochromatic process lens for photo engraving and three-color work. It was equally suited for half tone and line negatives, for engravers' cameras, and for use on view, commercial and copying cameras. The glasses were not antireflection coated. The lens was made between about 1924 and 1952. In 1952, the following speeds and focal lengths were produced: f/10, 12 inch for 9x13 format; f/10, 16 inch for12x15; f/10, 18 inch for 13x18; f/10, 21 inch for 16x20; f/10, 25 inch for 18x25; f/16, 30 inch for 20x30; f/16, 36 inch for 24x36, f/16, 42 inch for 30x40, and f/16, 48 inch for 36x48. Today you can get one for about $100 or less.
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