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gen. Öffnungen f archaeol. Blende f gen. Blende f Blendeneinstellung f Blendenöffnung f agric. Loch n Masche f Maul n Spalt m Anbohrung f Durchstich m Sonde f Spalte f Ritze f biol. Absorptionsapertur f Apertur f Eintrittsfläche f Kollektoreintrittsfläche f Kollektor-Aperturfläche m build.struct. Aussparung f Durchbruch m Zapfenloch n Rüstloch n chem. Apertur f (Blende) ; Mündung m Mund m Mundloch n commun. Öffnungsfläche f Öffnung f (antenna) ; Öffnungswinkel m commun., el. Punktgröße f Aperturfläche f Strahlaustrittsfläche f comp. Öffnung f Bildpunktblende f construct. Fensteroeffnung f Lichtöffnung f fish.farm. Maschenweite f (auch: lichte Maschenweite) med. Maskenöffnung f Foramen n Orificium n Orifizium (orificium, ostium) ; Apertur f (orificium, ostium) ; Öffnung f (orificium, ostium) microsc. Blende f (Öffnung/Apertur) nucl.phys. Oeffnung f opt. Apertur f (of an optical system: the diameter of the largest bundle of light which can traverse the system) ; Ausschnitt m Blende f (of an optical system; the diameter of the largest bundle of light which can traverse the system) ; Blendenöffnung f (of an optical system: the diameter of the largest bundle of light which can traverse the system) ; Öffnung f (of an optical system: the diameter of the largest bundle of light which can traverse the system) ; relative Öffnung (ratio) paleont. Mundspalte f phys. Öffnung f (e.g. of the objective) ; Öffnungsblende f radiat. Aperturblende f tech. Bildfenster n Objektivblende f Blende Öffnung ; Fenster Öffnung ; Lochblende f Bildbuehne m Belichtungsfenster n Blendenausschnitt m Filmprojektionsfenster n Eintrittsoeffnung f Linsenoeffnung f Lochweite f Muendung f Schauloch n Strahlenoeffnung f transp., mech.eng. Öffnungsweite f weap. Loch n (im Diopter) commun. Antennenöffnung f antenn. strahlende Apertur einer Antenne opt. Öffnungsverhältnis n (the ratio of the focal length to the entrance pupil diameter) English thesaurus abbr., oil ap ; aper cinema A measure of the width of the opening allowing light to enter a camera. The apparent diameter of a lens viewed from the position of the object against a diffusely illuminated background is called the "effect aperture". The ratio of focal length of a lens to its "effective aperture" for an object located at infinity is called the "relative aperture", or "f/number". Larger apertures allow more light to enter a camera, hence darker scenes can be recorded. Conversely, smaller apertures allow less light to enter, but have the advantage of creating a large depth of field. See also shutter speed.
