Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 18
17. Figure 18 is a section of the camera.a is a lens of a perioscopic form, whoseradii of curvature are in the proportion of2 to 1. This meniscus is placed with its convex surface towards the plane of repre-sentation, and with its concavity towardsthe object. … 18. The aperture of the lens itself is madelarge, but the pencil of rays admitted islimited by a diaphragm, or stop, construct-ed as in the figure at 5, between it and theplane of representation, at about one-tenthof the focal length from the lens. By thisarrangement objects are represented…
Photography · Art and photography
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