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Coma of a single lens. Each cone of light focuses on different planes along the optical axis. In optics (especially telescopes), the coma (/ ˈ k oʊ m ə /), or comatic aberration, in an optical system refers to aberration inherent to certain optical designs or due to imperfection in the lens or other components that results in off-axis point sources such as stars appearing distorted ...
In most cases, two thin lenses are combined, one of which has just so strong a positive aberration (under-correction, vide supra) as the other a negative; the first must be a positive lens and the second a negative lens; the powers, however: may differ, so that the desired effect of the lens is maintained. It is generally an advantage to secure ...
Diane Arbus (/ d iː ˈ æ n ˈ ɑːr b ə s /; née Nemerov; March 14, 1923 – July 26, 1971 [2]) was an American photographer. [3] [4] She photographed a wide range of subjects including strippers, carnival performers, nudists, people with dwarfism, children, mothers, couples, elderly people, and middle-class families. [5]
Now that the Android-first Google Lens feature has finally rolled out to the Photos app on iOS devices, nearly all mobile users can appreciate a recently-added feature: Identifying pet breeds.
The test was created by Gerald S. Blum in 1947, [1] who was later Professor of Psychology at the University of Michigan. [2] The drawings depicted a family of cartoon dogs in normal situations which could be related to psychoanalytic theory. The main character, "Blacky", was accompanied by a sibling Tippy, and by a mother and father.
However, Shola, an English Shepherd who was forced to retire as a mountain rescue dog due to the condition, has helped scientists create a new test that could mean the end of PRA.
Shany Dror, leading researcher, from the Family Dog Project, Eotvos Lorand University, Hungary, said: “We know that dogs can easily learn words that are linked to actions, such as ‘sit’ or ...
As a lens is stopped down from its maximum (widest) aperture, most lens aberrations (spherical aberration, coma and astigmatism) are decreased, but lens diffraction increases. The effect is that for most lenses, the balance between the decreasing aberrations and the increasing diffraction effects of stopping down the lens means that lenses have ...