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.

Bibliographische Detailangaben

1. Verfasser:	KUGLER, RUDOLF
Format:	Patent
Sprache:	eng ; ger
Schlagworte:	OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS
Online-Zugang:	Volltext bestellen
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