Vest Pocket Kodak: The Vest Pocket Kodak cameras were a best-selling folding camera series made by Eastman Kodak (Rochester), from 1912 to 1926. They were the first cameras to use the smaller 127 film reels.
Meniscus Lens: Convex-concave (meniscus) lenses can be either positive or negative, depending on the relative curvatures of the two surfaces. A negative meniscus lens has a steeper concave surface and will be thinner at the centre than at the periphery.
Rapid Rectilinear Lens (RR Lens): The Rapid Rectilinear is a lens that is symmetrical about its aperture stop with four elements in two groups. It was introduced by John Henry Dallmeyer in 1866. The symmetry of the design greatly reduces radial distortion.
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