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Ludwig Schupmann
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Ludwig Ignaz Schupmann was a German professor of architecture and an optical designer. He is principally remembered today for his Medial and Brachymedial telescopes, types of catadioptric reflecting-r
Rathenow's Giant Telescope in the modern "Park of Optics" where it is located since 2009.
Rathenow's Giant Telescope in the modern "Park of Optics" where it is located since 2009.
Medial Telescopes (types A and B) according to Schupmann 1899
Medial Telescopes (types A and B) according to Schupmann 1899
Brachymedial Telescopes (types A and B) according to Schupmann 1899
Brachymedial Telescopes (types A and B) according to Schupmann 1899
Giant "brachymedial" (shortened hybrid) telescope built in the city of Rathenow near Berlin by Edwin Rolf 1949-1953 (around 1953).
Giant "brachymedial" (shortened hybrid) telescope built in the city of Rathenow near Berlin by Edwin Rolf 1949-1953 (around 1953).
Chromatic aberration
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In optics, chromatic aberration, also called chromatic distortion, color aberration, color fringing, or purple fringing, is a failure of a lens to focus all colors to the same point. It is caused by d
Ludwig Schupmann
…remembered today for his Medial and Brachymedial telescopes, types of catadioptric reflecting-refracting telescopes with Mangin mirrors that eliminate chromatic aberrations while using common optical glasses. Used in early lunar studies, they are used now in double-star work. In 1882, electric street lighting was put into…
Photographic example showing a lens with low chromatic aberration (top) compared to a lens exhibiting strong transverse chromatic aberration (seen as
Photographic example showing a lens with low chromatic aberration (top) compared to a lens exhibiting strong transverse chromatic aberration (seen as a blur and a rainbow edge in areas of contrast)
Color shifting through corner of eyeglasses
Color shifting through corner of eyeglasses
Severe purple fringing can be seen at the edges of the horse's forelock, mane, and ear.
Severe purple fringing can be seen at the edges of the horse's forelock, mane, and ear.
This photo taken with the lens aperture wide open resulting in a narrow depth-of-field and strong axial CA. The pendant has purple fringing in the nea
This photo taken with the lens aperture wide open resulting in a narrow depth-of-field and strong axial CA. The pendant has purple fringing in the near out-of-focus area and green fringing in the distance. Taken with a Nikon D7000 camera and an AF-S Nikkor 50 mm f/1.8G lens.