Zeiss Sonnar
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The Zeiss Sonnar is a photographic lens originally designed by Dr. Ludwig Bertele in 1929 and patented by Zeiss Ikon. It was notable for its relatively light weight, simple design and fast aperture.
A Sonnar 135 mm f/3.5 from Carl Zeiss Jena
Photographic lens design
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The design of photographic lenses for use in still or cine cameras is intended to produce a lens that yields the most acceptable rendition of the subject being photographed within a range of constrain
Elements of an inexpensive 28mm lens
Photographic lens cut for demonstration
Diagram of Petzval's 1841 portrait lens - crown glass shaded pink, flint glass shaded blue