FILM 250 Study Guide - Final Guide: Telephoto Lens, Progressive Scan, Focal Length

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The technical definition of aperture is: the opening in a lens through which light passes to enter the camera. Distance from lens convergence to sensor within the camera, measured in millimeters. Backed by physics and complex ideas, fully understanding focal length can be a bit challenging. In plain english, however, it determines how zoomed in" photos are. Therefore, a lens with a short focal length requires that you have to be close to your subject, while a long focal length allows you to be as far away from a subject and still get a close-up. Depth of field is the distance between the closest and farthest objects in a photo that appears acceptably sharp. An aspect ratio is a proportional relationship between an image"s width and height. Interlaced scan: half the picture appears on the screen at a time. The other half of the picture follows an instant later (1/60th of a second, to be precise).

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