An introduction to the science & practice of photography (1891)
Jones, H. Chapman (Henry Chapman), 1854- · London : Iliffe & Son · leaf 131
mbinations are each Fig. 25. achromatic, and the central combination, which is diverging or negative, serves to flatten the field. By removing the central combination the focal length of the whole lens is reduced, and its aperture, originally is enlarged sufficiently for portraiture. The need for a… … Fig. 26. In the same year C. C. Harrison patented his " globe " lens, so called because the outer surfaces of the combina-
Photography
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