aperture

1. A small or narrow opening, gap, slit, or hole.

   an aperture in a wall

   Öffnung

   отве́рстиеotvérstije, проёмprojóm

   an man-made opening; usually small

2. A hole which restricts the diameter of the lightpath through one plane in an optical system.

   Blende

   затворzatvor, обтюраторobtjurator, диафра́гмаdiafrágma

3. A hole which restricts the diameter of the lightpath through one plane in an optical system.

   The diameter of such a hole which restricts the width of the lightpath through the whole system. For a telescope, this is the diameter of the objective lens.

   This telescope has a 100 cm aperture.

   Blendenzahl

   диафра́гмаdiafrágma, апертураapertura

4. The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.

5. (rare)The maximum angle between the two generatrices.

   If the generatrix makes an angle θ to the axis, then the aperture is 2θ.

1. What is the correct aperture in this light?

   deWas ist die richtige Blende bei dieser Beleuchtung? — MikeMolto

   CC BY 2.0 FR · Tatoeba · Shiawase · C1Open on TatoebaReport a problem

2. You need a wider aperture, or you won't get enough light reaching the film.

   CC BY 2.0 FR · Tatoeba · AlanF_US · C1Open on TatoebaReport a problem

3. Glancing upward, I saw the aperture, a small blue disc, in which a star was visible.

   CC0 · Tatoeba · shekitten · C1Open on TatoebaReport a problem

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