Primitive Photography: A Guide to Making Cameras, Lenses, and Calotypes (Alternative Process Photography) by Alan Greene

Author:Alan Greene [Greene, Alan]
Language: eng
Format: azw3
Publisher: Taylor and Francis
Published: 2013-04-10T16:00:00+00:00

Just about the only triplet lens design coming close to Sutton’s symmetrical design was the Cooke triplet, designed by Dennis Taylor in 1893. In this case, the stop was located to the rear of the central bi-concave element. Used at full aperture, or f4, it had a circle of definition measuring approximately 13°, so it was extremely narrow-angle. Nevertheless, the design was highly influential on later triplet modifications. Taylor’s working method is worth mentioning. According to Rudolf Kingslake, “… Taylor worked entirely by algebraic formulae, which he developed himself, and he claimed that he never traced any rays. When the design was as good as he could make it, the actual lens was fabricated, and examination of the image on a lens-testing bench suggested changes that should be made to improve the performance.”46

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