Aplanat
A photographic lens which has been corrected for spherical aberration.
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-Aplanat - lens which has been corrected for spherical aberration.
-Apochromat - lens corrected for chromatic aberration in all three primary colors.
Aplanat and wide angle Aplanat
made with a Rectilineaire Extra Rapide on an Antique Camera Simulator
Links Edit ...
"Theory and Design of Aplanatic Reflectors Employing a Correcting Lens". in Ingalls, Albert G.. Amateur Telescope Making Advanced. Scientific American. pp. 401-409.
^ Telescope Optics - SCHMIDT
^ "Obstruction" in optical instruments ...
 See also: Photograph, Lens, Meter, Camera, Light
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