Petzval lens

Petzval lens - early lens system developed by Joseph Petzval. It had a very wide aperture and was relatively free from aberration. Many modern lenses have developed from this simple three-element design.

The Petzval lens (or Petzval portrait lens) is the oldest notable lens design for photography. It wa
Petzval lens
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See also: Element, Focusing, Lens group, Lens elements, Lens element