Focal length extension used in a Newton reflecting telescope to reduce obstruction is achieved by a concave lens which expands the beam path coming from the primary mirror

Focal length extension used in a Newton reflecting telescope to reduce obstruction is achieved by a concave lens which expands the beam path coming from the primary mirror

Focal length extension is achieved by a concave lens which expands the beam path coming from the primary mirror. The lens can be fixed in the eyepiece holder or in the barrel body.

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Bibliographische Detailangaben
1. Verfasser: KUGLER, RUDOLF
Format: Patent
Sprache:eng ; ger
Schlagworte:
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Beschreibung
Zusammenfassung:Focal length extension is achieved by a concave lens which expands the beam path coming from the primary mirror. The lens can be fixed in the eyepiece holder or in the barrel body.