Terms for subject Optics

English	German
fold-away magnifying lens	wegklappbare Lupe
fold-away magnifying lens	Einschlaglupe
fold-away stand	Klappständer
fold back	zurückschwenken
fold back	zurücklenken
fold out	herausklappen
fold the beam	den Strahl umlenken (to make a system more compact)
fold the beam	den Strahlengang knicken (to make a system more compact)
fold the beam	den Strahlengang falten (to make a system more compact)
fold the beam down	den Strahl nach unten ablenken
fold the optical light path	den Strahlengang knicken (e.g. by incorporating a mirror to ensure a compact assembly)
fold through 90°	urn 90° knicken
fold up an optical system	ein optisches System knicken (so that it may fit into a smaller space)
folding camera	Balgenkamera
beam folding mirror	Spiegel zur Strahlknickung
folding of the optical path	Knickung des Strahlenganges
folding pocket stereoscope	zusammenlegbares Taschenstereoskop
folding staff	zusammenklappbare Latte
path-folding mirror	Umlenkspiegel (often required to fit the instrument into the available space, e.g. in rockets)
sixteen-fold	sechzehnfach (e.g. increase)