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These allow high-quality 21st century binoculars to practically achieve at the eye lens or ocular lens measured over 90% light transmission values in low light conditions. Depending on the coating, the character of the image seen in the binoculars under normal daylight can either look "warmer" or "colder" and appear either with higher or lower ...
electrical pins, drive shaft for focus. The Pentax K-mount, sometimes referred to as the "PK-mount", is a bayonet lens mount standard for mounting interchangeable photographic lenses to 35 mm single-lens reflex (SLR) cameras. It was created by Pentax in 1975, [ 1] and has since been used by all Pentax 35 mm and digital SLRs and also the MILC ...
Chromed FE2 with 50 mm F/1.4 lens. FE2 underside. The Nikon FE2 is a 35 mm single lens reflex (SLR) camera manufactured by Nippon Kogaku K. K. ( Nikon Corporation since 1988) in Japan from 1983 to 1987. The FE2 uses a Nikon-designed vertical-travel focal-plane shutter with a speed range of 8 to 1/4000th second, plus Bulb and flash X-sync of 1 ...
Cardinal point (optics) In Gaussian optics, the cardinal points consist of three pairs of points located on the optical axis of a rotationally symmetric, focal, optical system. These are the focal points, the principal points, and the nodal points; there are two of each. [ 1] For ideal systems, the basic imaging properties such as image size ...
Cataract surgery is the most common application of lens removal surgery, and is usually associated with lens replacement. It is used to remove the natural lens of the eye when it has developed a cataract, a cloudy area in the lens that causes visual impairment. [ 4][ 10] Cataracts usually develop slowly and can affect one or both eyes. [ 4]
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses ( elements ), usually arranged along a common axis.
At Stony Point, fundamentals are paramount and it shows in the won-lost record — 38-2 this past season. His solution: more practices, less games.
The polio virus is 30 nm in diameter. [ 1] Transmission electron microscopy ( TEM) is a microscopy technique in which a beam of electrons is transmitted through a specimen to form an image. The specimen is most often an ultrathin section less than 100 nm thick or a suspension on a grid. An image is formed from the interaction of the electrons ...