The Dictionary Of Photography

A True Historic Record Of The Art & Practice Of Photography 100 Years Ago.

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may be used as a single landscape by unscrewing the same, and screwing into the place of the back lens. The front combi-
Fig. 95-
nation is of Jena flint combined with crown glass, and of great curvature, whilst the back glass is of much less power. Messrs. Taylor, Taylor & Hobson, Wray & Swift have introduced special
Fig. 96.
f/5'6 for detective
lenses, which, in the smaller sizes, work at
cameras, although any of the above lenses of sufficiently short focus would answer well. Messrs. Perken, Son, & Rayment