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As you look through the viewfinder of an SLR it should give you as near as possible what will appear in your image. Because of the design, position and size of mirror/pentaprism, etc., this is not always possible and you often see less than 100%. The higher this figure is, the more accurate the results will be. It's usually only professional cameras that give 100% accuracy.
A distance, or angle, measure given by binocular manufacturers that's similar to angle of view on a lens. It's usually indicated in degrees or as a width in meters at 1000m. A pair of binoculars with, for example, 6 or 105m at 1000m indicates that you will see a 105m span when you're viewing a subject that's 1000m away. A wider field of view is better for looking at wider expanses - birds in flight, horse racing, starry skies, etc.
Describes how much an imaging sensor has been cropped in relation to its full-frame equivalent. It always describes how many times larger the full-frame is in relation to the cropped sensor. Take an APS-C sensor with a crop factor of 1.6, for instance. This indicates the sensor is 60% of the size of a frame of 35mm film. The crop factor is used to calculate how much of the equivalent of the full-frame field of view the cropped sensor will have with a lens. In order to calculate this, one multiplies the focal length of the lens by the crop factor. A 1.6 crop-factor, for instance, will give a 100mm lens the same field of view as a 160mm lens on a full-frame camera.
A button or lever on the camera that either stops the lens aperture down manually or electronically. This enables you to view the image at the aperture that will be used to take the picture. The view will be darker, but you will be able to see exactly what will and won't be sharp or in focus. See "Using the depth of field button" in the Techniques section.
A folding view-camera that's usually made of wood or light metal for use on location.