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A home-made pinhole camera lens
A home-made pinhole camera lens
A home-made pinhole camera (on the left), wrapped in black plastic to prevent light leaks, and related developing supplies
A home-made pinhole camera (on the left), wrapped in black plastic to prevent light leaks, and related developing supplies
An example of a 20-minute exposure taken with a pinhole camera
An example of a 20-minute exposure taken with a pinhole camera
A photograph taken with a pinhole camera using an exposure time of 2s
A photograph taken with a pinhole camera using an exposure time of 2s
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Different apertures of a lens
Different apertures of a lens
In biology, the pupil (appearing as a black hole) of the eye is its aperture and the iris is its diaphragm. In humans, the pupil can constrict to as s
In biology, the pupil (appearing as a black hole) of the eye is its aperture and the iris is its diaphragm. In humans, the pupil can constrict to as small as 2 mm (f/8.3) and dilate to larger than 8 mm (f/2.1) in some individuals.
A camera aperture
A camera aperture
Alvin Clark polishes the big Yerkes Observatory Great Refractor objective lens, with 40 inches 102 cm across, in 1896.
Alvin Clark polishes the big Yerkes Observatory Great Refractor objective lens, with 40 inches 102 cm across, in 1896.