Category Archives: Technical

Digital camera ISO speed or Film speed From Wikipedia Film speed is the measure of a photographic film’s sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. Relatively insensitive film, with a correspondingly lower speed index requires more exposure to light to produce the same … Continue reading

What is F-number “F number” redirects here. For other uses, see F scale.   Diagram of decreasing apertures, that is, increasing f-numbers, in one-stop increments; each aperture has half the light gathering area of the previous one. The actual size of the aperture will depend on the focal length of the lens. In optics, the … Continue reading

Camera Zone System The Zone System is a photographic technique for determining optimal film exposure and development, formulated by Ansel Adams and Fred Archer in 1939–1940.  The Zone System provides photographers with a systematic method of precisely defining the relationship between the way they visualize the photographic subject and the final results. Although it originated … Continue reading

Camera Red-eye effect Intense red-eye effect in blue eyes with dilated pupil The red-eye effect in photography is the common appearance of red pupils in color photographs of eyes. It occurs when using a photographic flash very close to the camera lens (as with most compact cameras), in ambient low light. The effect appears in … Continue reading

  // What is Exposure compensation From Wikipedia Exposure compensation is a technique for adjusting the exposure indicated by a photographic exposure meter, in consideration of factors that may cause the indicated exposure to result in a less-than-optimal image. Factors considered may include unusual lighting distribution, variations within a camera system, filters, non-standard processing, or … Continue reading

What is Exposure (photography)   “Underexposure” redirects here. For the 2005 film by Oday Rasheed, see Underexposure (2005 film). A photograph with an exposure time of 1/13 second blurs the motion of flying birds.   A photograph of the sea after sunset with an exposure time of 15 seconds. The swell from the waves appears … Continue reading