Ludwig Ignaz Schupmann (23 January 1851 in

Geseke ''Geseke'' () is a town in the administrative district of Soest, in North Rhine-Westphalia, Germany. Geography Geseke is situated approximately 12 km south-east of Lippstadt and 20 km south-west of Paderborn. The city is located at the ...

(

Westphalia Westphalia (; german: Westfalen ; nds, Westfalen ) is a region of northwestern Germany and one of the three historic parts of the state of North Rhine-Westphalia. It has an area of and 7.9 million inhabitants. The territory of the regio ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

– 2 October 1920 also in

) was a German

professor Professor (commonly abbreviated as Prof.) is an Academy, academic rank at university, universities and other post-secondary education and research institutions in most countries. Literally, ''professor'' derives from Latin as a "person who pr ...

architecture Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing building ...

and an optical designer. He is principally remembered today for his Medial and Brachymedial telescopes, types of

catadioptric A catadioptric optical system is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics). Catadioptric combinations are used in focusing systems such as searchlights, he ...

reflecting-refracting telescopes with

Mangin mirror In optics, a Mangin mirror is a negative meniscus lens with the reflective surface on the rear side of the glass forming a curved mirror that reflects light without spherical aberration if certain conditions are met. This reflector was invented i ...

s that eliminate

chromatic aberration In optics, chromatic aberration (CA), also called chromatic distortion and spherochromatism, is a failure of a lens to focus all colors to the same point. It is caused by dispersion: the refractive index of the lens elements varies with the wave ...

s while using common optical glasses. Used in early lunar studies, they are used now in

double-star In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the aid of optical telescopes. This occurs because the pair either forms a binary star (i.e. a ...

work. The

asteroid An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. ...

5779 Schupmann is named in his honour.

Works

''Die Medial-Fernrohre - Eine neue Konstruktion für große astronomische Instrumente'', Teubner-Verlag, 1899

External links

Ludwig Schupmann and some Early Medial Telescopes
1851 births 1920 deaths Architects from North Rhine-Westphalia Telescope manufacturers German scientific instrument makers People from Geseke {{Germany-academic-bio-stub