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![Examples of anastigmat lens designs: Symmetric design by Emil von Höegh (1892) with six elements in two groups; marketed as the Double Anastigmat Goerz, aka Dagor, by Goerz. Asymmetric Zeiss Biotar double Gauss lens design by Willy Merté [de] (1927), with six elements in four groups. The controllable aperture stop is typically placed in the middle of the composite lens (between the so-called eye- and field-lenses), and its maximum diameter (the one shown) dictates the minimum F-number for each lens.](view_image.php?q=Anastigmat&sq=Qlik&lang=&file=File:Lens_anastigmat.svg)
Examples of anastigmat lens designs:
- Symmetric design by Emil von Höegh (1892) with six elements in two groups; marketed as the Double Anastigmat Goerz, aka Dagor, by Goerz.
- Asymmetric Zeiss Biotar double Gauss lens design by Willy Merté (1927), with six elements in four groups.
An anastigmat or anastigmatic lens is a photographic lens completely corrected for the three main optical aberrations: spherical aberration, coma, and astigmatism. Early lenses often included the word Anastigmat in their name to advertise this new feature (Doppel-Anastigmat, Voigtländer Anastigmat Skopar, etc.).