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The reflector factor is the ratio of the illumination provided by a lamp fitted within a reflector to the illumination provided without any reflector fitted. A matte reflector will typically have a reflector factor of around 2, due to its more diffuse effect, while a polished or metallic-finished reflector may have a factor of up to 6. [1]
Also may mean "Perspective Control" for a lens that has the ability to shift to tilt to control linear perspective in an image. May also stand for personal computer in conjunction with digital photography. PDAF: Phase-detection autofocus. One of the mechanisms of automatic lens focusing. PF: Purple fringing. A form of chromatic aberration in ...
In practical terms, it means that if one face in a group portrait is 4 metres from the "key" light and another is 5.6 m away, the face further from the light will be one f/stop darker. In an outdoor portrait of a group of 200 people taken on an overcast day, the lighting of all the faces will be equal.
The first permanent photograph, a contact-exposed copy of an engraving, was made in 1822 using the bitumen-based "heliography" process developed by Nicéphore Niépce.The first photographs of a real-world scene, made using a camera obscura, followed a few years later at Le Gras, France, in 1826, but Niépce's process was not sensitive enough to be practical for that application: a camera ...
This is particularly useful if the subject includes dangerous animals (e.g., wildlife); the subject prefers anonymity to being photographed; or else, the photographer's presence is unwanted (e.g., celebrity photography or surveillance photography).
Photography – process of making pictures by the action of recording light patterns, reflected or emitted from objects, on a photosensitive medium or an image sensor through a timed exposure. The process is done through mechanical , chemical , or electronic devices known as cameras .
The actress helped inspire the look for the famous logo, one of several actresses ordered by Columbia Pictures to pose as Miss Liberty, for which she was only paid $25. (Photo: Tim Boyle ...
The term vernacular photography is used in several related senses. Each is in one way or another meant to contrast with received notions of fine-art photography. [1] [2] Vernacular photography is also distinct from both found photography and amateur photography. The term originated among academics and curators, but has moved into wider usage.