DC (Defocus Control)
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Focus control for optical coincident-type rangefinders
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DC (Defocus Control) A lens which allows the photographer to control the degree of spherical aberration in the foreground or background by rotating the lens' DC ring. Find out more.Definition The clarity of detail within a photograph.
Nikon's Defocus Control, or DC, lenses for their popular 35mm SLR cameras actually allow one to manipulate the nature of the spherical aberration correction to allow one to locate the region of good bokeh to be either in the foreground or background.
Zoom and focus control
The GX1 takes advantage of Panasonic's recently introduced power zoom lenses by allowing you to zoom in and out via the touchscreen.
The one innovative control device that the DP series has is the manual focus control wheel. Unlike most other compact digital cameras, you don't have to press buttons to change your focus distance when using manual focus.
One early device mechanically jiggled the focus control during exposure, the apparent aim being to increase depth of field. Some early lenses were advertised as having great depth of field. This was the same as saying that they were soft.
As an extra focus control measure I took three shots of each subject and re-focused in-between each shot. I examined the images and looked for the best focused shot. In truth, there was almost no difference in focus in the series of images.
Overview: Panasonic's premium compact camera, the DMC-LX5 is designed to appeal to street photographers with its compact design, fast-reacting shutter release, and easy-to-change manual exposure and focus controls, ...
A camera with a fixed focus (or "panfocus") lens has no focus control. The focus is preset by the designer, usually at a distance for which depth of field will reach infinity even at the greatest aperture possible with the lens.
-Distance symbols - symbols used on the focus control of simple cameras, as a focusing guide.
-Distortion - alteration in shape and/or proportions of an image.
135mm 2.8 SF, Ø52
Old-style barrel, adjustable soft focus control
Category 5 - specialized lenses.
Unusual, expensive and specialized lenses.
High-end fixed lens cameras usually have a zoom lens and many of the exposure and focus controls found on SLR cameras.
It assesses subject distance (usually by comparing two images), and displays this information in the viewfinder. This device may be linked directly to the lens focus control, to give a coupled rangefinder
(see Coupled rangefinder) ...
In workshops I teach, a Most Frequently Asked Question is, “When you go out to shoot, how do you start?' What the student usually wants to know is about setting up the camera—f stop, metering, focus controls, etc.
batteries and a voltage-multiplying circuit which discharge a brief, intensive burst. Generally considered to have the same photographic effect as daylight. Modern flash units have multiple TTL exposure control functions and auto focus control.
a camera's autofocus can be disastrous for an image, so this should only be used as a rough guide; precision adjustments should almost always be done using manual focus. In addition, special equipment can be very helpful for improving focus control: ...
Modern flash has multiple TTL flash exposure control functions and even extend to autofocus control. Some specialized flash are high speed repeating flash which can use for strobocopic effect, UV-flash for ultra violet light photography etc.
Modern flash has multiple TTL or ETTL-II flash exposure control functions and even extend to autofocus control.
Wide-angle or short-focal-length lenses are not as effective for selective focus because of the great depth of field they provide at most apertures. The following factors provide the maximum selective focus control by minimizing depth of field: ...
 See also: Focus, Camera, Image, Photograph, Exposure
  
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