ما معنىaperture؟
ما معنىaperture؟
- An opening, such as a hole, gap, or slit.
- A usually adjustable opening in an optical instrument, such as a camera or telescope, that limits the amount of light passing through a lens or onto a mirror.
- The diameter of such an opening, often expressed as an f-number.
- The diameter of the objective of a telescope.