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The streetlight effect, or the drunkard's search principle, is a type of observational bias that occurs when people only search for something where it is easiest to look. [1] Both names refer to a well-known joke: A policeman sees a drunk man searching for something under a streetlight and asks what the drunk has lost.
The effect can be obtained by a larger aperture, a close viewpoint, a larger image sensor or a longer focal length lens from a smaller distance. A tilt lens can be used, in the opposite way to that used to increase depth of focus. There are even adapters that allow lenses from 35 mm cine cameras to be used on smaller film and digital formats.
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.
Stereo photography techniques are methods to produce stereoscopic images, videos and films. This is done with a variety of equipment including special built stereo cameras, single cameras with or without special attachments, and paired cameras. This involves traditional film cameras as well as, tape and modern digital cameras.
With color film or video, a graduated neutral-density filter can achieve a similar effect, as can a polarizing filter. Using either of these filters can limit camera movement during a shot, as the axis of a graduated filter must match the horizon, and the effect of the polarizing filter changes as the axis of the camera lens moves relative to ...
Analog photography, also known as film photography, is a term usually applied to photography that uses chemical processes to capture an image, typically on paper, film or a hard plate. These processes were the only methods available to photographers for more than a century prior to the invention of digital photography , which uses electronic ...
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An example of the Brenizer method. The Brenizer method, sometimes referred to as bokeh panorama or bokehrama, is a photographic technique characterized by the creation of a digital image exhibiting a shallow depth of field in tandem with a wide angle of view.