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Fixed-focus lens. The back of an iPhone 3G, showing its small fixed-focus lens. Mid-20th-century medium-format fixed-focus camera. A photographic lens for which the focus is not adjustable is called a fixed-focus lens or sometimes focus-free. The focus is set at the time of lens design, and remains fixed. It is usually set to the hyperfocal ...
Circle of confusion. In optics, a circle of confusion (CoC) is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. It is also known as disk of confusion, circle of indistinctness, blur circle, or blur spot . In photography, the circle of confusion is used to determine the depth ...
In order to see a clear image, the eye must focus rays of light on to the light-sensing part of the eye - the retina, which is located in the back of the eye. This focusing - called refraction - is performed mainly by the cornea and the lens , which are located at the front of the eye, the anterior segment .
The Princess of Wales broke her silence today with a rare personal update on her cancer recovery and treatment process. In the frank letter, Kate said she is “making good progress” but ...
The Canon AL-1 was an FD mount, 35mm single-lens reflex camera introduced in March 1982. Its main feature was the "Quick Focus" focus-assist system that was aimed at those who had trouble focusing through the viewfinder—either novices, or those with poor eyesight—and was intended to head off competition from the first full-autofocus cameras from other manufacturers, such as the Pentax ME F.
Owen Hayes and Jake Traylor and Dareh Gregorian. June 24, 2024 at 8:06 PM. U.S. District Court for the Southern District of Florida. FORT PIERCE, Fla. — The judge presiding over Donald Trump ...
Diabetes and hearing loss are both prevalent conditions in the United States, and there is a strong link between the two. People with diabetes are more likely to develop sensorineural hearing loss ...
X-ray optics. X-ray optics is the branch of optics that manipulates X-rays instead of visible light. It deals with focusing and other ways of manipulating the X-ray beams for research techniques such as X-ray diffraction, X-ray crystallography, X-ray fluorescence, small-angle X-ray scattering, X-ray microscopy, X-ray phase-contrast imaging, and ...