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Title: Patent Portrait lens No.3B [Go to resource]
Description: Patent Portrait lens No.3B Approx F.4 11.5 inch f.l with Waterhouse stops. Back combination consists of two lenses; the separation of which can be varied by unscrewing the back cell and the degree of softness can be controlled. First patented in 1866. License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: lens Source: Science Museum Creator: J. H. Dallmeyer Ltd Identifier: 1979-559/1457 Go to resource More Like this...
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