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Digital Photography

Digital Photography terms

Aperture Refers to the lens opening that allows us to control the amount of light that reaches the film or digital sensor.
Camera A light-tight box that contains a light-sensitive material or device and a way to let in a desired amount of light at particular times to create an image on the light-sensitive material.
Converging or convex lens Bends the light toward the center of the lens, since one or both sides of the glass curve out.
Digital camera Uses an electronic image sensor to digitally record an image.
dSLR A digital version of the traditional SLR camera.
Iris diaphragm Controls the aperture a set of overlapping metal plates that expand out to allow more light or fold in on each other to reduce the amount of light.
Digital zoom Crops the image and enlarges the cropped image to fill the frame of the camera.
Focal length The distance between the lens and the film, when the lens is focused at an infinite distance.
JPEG Stands for “Joint Photo Experts Group”; the default file format in many digital cameras on the market today.
Large and medium format cameras Use a negative film size that is greater than the usual 35mm.
Lens “A ground or molded piece of glass, plastic, or other transparent material with opposite surfaces either or both of which are curved, by means of which light rays are refracted so that they converge or diverge to form an image.”
Optical zoom Works like a telephoto lens; the image quality remains the same as the image is magnified.
Pentaprism Five-sided mirror whose job it is to flip the light from the image so that the image appears right side up rather than the shows the inverted image that first occurs.
Pinhole camera The smallest unit of the picture that can be controlled.
Point and shoot camera Uses an optical viewfinder, rather than having the semiautomatic mirror.
RAW or NEF A file format that is offered on some digital cameras. This file saves the actual data, which are not processed by the camera
Sensitivity The equivalent of film speed on a digital camera. Shutter Opens and closes between the film and the lens, letting light in only when you have told the camera to do so.
Shutter speed The length of time that light is let into the camera to expose the film.
Speed Tells the size of the grain in film.
Telephoto lenses Those that magnify an image or make an object seem closer than it really is. TIFF Tagged Image
File Format a lossless file format. White balance An adjustment that can be made to the color so that whites will appear white and not yellow or blue in the photograph.
Wide-angle lens Shrinks the object in front of it, by way of a shorter focal length.
Created by: cpaine



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