number aperture
91Portal (video game) — Portal Portal s box art displays a figure moving into a portal. Signs of this style are commonly used in the game s environment. Developer(s) …
92Antenna (radio) — Whip antenna on car …
93Optical telescope — Eight Inch refracting telescope (Chabot Space and Science Center) An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for… …
94Nikon F3 — Type Single lens reflex Film format 35 mm Film size 36 mm × 24 mm Lens Nikon F mount …
95Fresnel diffraction — In optics, the Fresnel diffraction equation for near field diffraction, is an approximation of Kirchhoff Fresnel diffraction that can be applied to the propagation of waves in the near field.[1] The near field can be specified by the Fresnel… …
96Single-lens reflex camera — The single lens reflex (SLR) camera uses an automatic moving mirror system which permits the photographer to see exactly what will be captured by the film or digital imaging system, as opposed to non SLR cameras where the view through the… …
97Nikon FA — Controls The Nikon FA was an advanced amateur …
98Canon Digital IXUS — The original Canon Digital Ixus. The Digital IXUS (IXY Digital in Japan and PowerShot Digital ELPH in US and Canada) is a series of digital cameras released by Canon. It is a line of ultracompact cameras, originally based on the design of Canon s …
99Canon A-1 — The Canon A 1 is an advanced level, interchangeable lens, 35 mm film, single lens reflex (SLR) camera. It was manufactured by Canon Camera K. K. (today Canon Incorporated) in Japan from April 1978 to 1985. It used a horizontal cloth curtain focal …
100Entrance pupil — For the part of the eye, see Pupil. A camera lens adjusted for large and small aperture. The entrance pupil is the image of the physical aperture, as seen through the front of the lens. The size and location may differ from those of the physical… …
