Telescope Lenses Glasses

Telescope Lenses Glasses. By Holger Riess, 20 October, 2017 08:39:51.

Safe and unsafe uses of eclipse glasses and solar filter materials

Safe and unsafe uses of eclipse glasses and solar filter materials


Die Entfernung als Wert zu messen und zu kennen ist in vielen Bereichen der Fotografie aber notwendig, um z. B. den Schärfenbereich eines Objektivs nutzen zu können oder in der Infrarotfotografie den Fokuspunkt auf den Infrarotindex zu korrigieren. Auf die Bedeutung der Entfernungsmessung in der Fotografie musste bei den ersten angebotenen Modellen[1] noch deutlich hingewiesen werden. Mittlerweile existiert eine Vielzahl von technischen Varianten.

Mit Radarwellen können Entfernungen zwischen wenigen Zentimetern und mehreren Millionen Kilometern gemessen werden, weshalb sie häufig in der Luftfahrt eingesetzt werden. Die Antenne sendet kurze Impulse bei einer Frequenz von einigen Gigahertz (109 Hertz) und misst die Zeit bis zum Empfang des vom Messobjekt reflektierten Signals. Neben der Entfernung können auch noch die Geschwindigkeit und die Richtung des Objektes gemessen werden.

Bereits im Altertum wurde die Triangulation zur Landvermessung eingesetzt und wird bis auf technische Neuerungen auch heute noch dafür verwendet. Hinzugekommen sind Verfahren der optischen Messtechnik wie die Streifenprojektion und die Photogrammetrie, die andere Anwendungsbereiche erschlossen haben.

Je steiler eine zurückgelegte Wegstrecke ist, desto größer ist die Abweichung zwischen der tatsächlichen und der vom GPS-System angezeigten Strecke (für letztere findet sich die Bezeichnung Pseudo distance; ein deutsches Synonym hat sich wohl noch nicht etabliert).

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