aperture / cover / visor
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aperture
In photography, the adjustable opening in a lens that regulates how much light falls on the sensor or film.
Für ein Porträt mit unscharfem Hintergrund solltest du eine offene Blende wählen.
For a portrait with a blurred background, you should choose a wide-open aperture.
The noun 'die Blende' (aperture/cover/visor) is derived from the verb 'blenden' (to dazzle), which means 'to prevent someone from seeing because of overly bright light.' All meanings have to do with blocking light or covering something.
Die Scheinwerfer des entgegenkommenden Autos blendeten mich.
The headlights of the oncoming car dazzled me.
In the context of photography, 'die Blende' (aperture) is a technical term for the opening of the lens. Typical verbs in this context are 'einstellen' (to set), 'öffnen' (to open), and 'schließen' (to close).
Um mehr Licht einzufangen, musst du die Blende weiter öffnen.
To capture more light, you need to open the aperture wider.
When it comes to furniture, construction, or interior design, 'die Blende' (cover/panel) refers to a panel or covering. It is often used with the verb 'verstecken' (to hide) or the preposition 'hinter' (behind).
Wir haben die Kabel hinter einer Blende an der Wand versteckt.
We hid the cables behind a cover panel on the wall.
In a car, 'die Blende' (visor) usually means the sun visor. The typical verb used with it is 'herunterklappen' (to fold down), in order to protect yourself from the sun.
Die Sonne scheint stark, klapp doch bitte die Blende herunter.
The sun is shining strongly; please fold down the visor.
closure / fastener
'der Verschluss' and 'die Blende' can both be parts of a camera in photography, but they have different functions. The shutter opens only for a short moment and determines how long light falls on the sensor. The aperture is the opening in the lens and determines how much light comes in. Learners may confuse the words because both have to do with light and camera settings. In practical terms, you can say: the shutter controls the time, and the aperture controls the size of the opening.
Für das Foto im dunklen Raum stellt Tom die Blende weiter auf.
For the photo in the dark room, Tom opens the aperture wider.
Bei der alten Kamera öffnet sich der Verschluss manchmal zu langsam.
On the old camera, the shutter sometimes opens too slowly.