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The aspect ratio of a standard 35 millimeter frame is around 1.37:1, although cameramen may use only the part of the frame which will be visible on a television screen (which is 1.33:1 for standard television). Viewfinders are typically inscribed with a number of frame guides, for various ratios.

Note that aspect ratio refers here to the projected image. There are various ways of producing a widescreen image of any given proportion.

• Anamorphic: used by Cinemascope, Panavision and others. Anamorphic camera lenses compress the image horizontally so that it fits a standard frame, and anamorphic projection lenses restore the image and spread it over the wide screen. The picture quality is reduced because the image is stretched to twice the original area, but improvements in film and lenses have made this less noticeable.

• Masked: the film is shot in standard ratio, but the top and bottom of the picture are masked off by mattes in the projector. Alternatively, a hard matte in the camera may be used to mask off those areas while filming. Once again the picture quality is reduced because only part of the image is being expanded to full height. Sometimes films are designed to be shown in cinemas in masked widescreen format but the full unmasked frame is used for television. A low-budget movie called Secret File: Hollywood, often ridiculed as a collection of bloopers, is actually an example of a film that is always projected wrong. All the lights and microphone booms visible above the actors should be concealed by a projection matte, creating an image that would fill a wide screen for little money.

• Multiple camera/projector: the Cinerama system originally involved shooting with three synchronized cameras locked together side by side, and projecting the three resulting films on a curved screen with three synchronized projectors. Later Cinerama movies were shot in super anamorphic (see below), and the resultant widescreen image was divided into three by optical printer lenses to produce the final threefold prints. The technical drawbacks of Cinerama are discussed in its own article.

• Big film format: a 70mm film frame is not only twice as wide as a standard frame but also has greater height. Shooting and projecting a film in 70mm therefore gives more than twice the image area of non-anamorphic 35mm film with no loss of quality.

• Super anamorphic: 70mm with anamorphic lenses creates an even wider high-quality picture.

Historically, consumer TVs have been 4:3 and since many American TV viewers seem to prefer to see a TV screen completelly filled with image, American TV stations often show widescreen movies with sides truncated, using a technique called pan and scan. Because of this truncation, part of the image is lost. While many modern film viewers consider this a great loss, this has not always been the case: the original standard aspect ratio for films was 4:3 (which is why most television sets are built to that specification), and the switch to a wider format was met with some resistance within the film industry. Today, however, it is solidly the norm.

In Europe, the PAL TV format with its higher number of visible screen lines (576 vs. 483 for American NTSC) means that the low vertical resolution associated with showing uncropped widescreen movies on TV is not as bad, which has resulted in most European TV stations showing widescreen movies uncropped, and in the general unavailability of cropped "fullscreen" DVDs of widescreen movies in the European DVD market. There is even an extension to PAL, called PAL plus , which allows specially equipped receivers to receive a PAL picture as true 16:9 with full 576 lines of vertical resolution, provided the stations employ the same system. Standard PAL receivers will receive such a broadcast as a 16:9 image letterboxed to 4:3, with a small amount of color noise in the black bars; this "noise" is actually the additional lines which are hidden inside the color signal. This system has no equivalent in analog NTSC broadcasting.

The past decade has seen a growth in the number of 16:9 TV sets. These are typically used in conjunction with Digital TV receivers, DVD players and other Digital Television Sources. Digital material is provided to widescreen TVs either in High-Definition ( HDTV) format, which is natively 16:9, or as an anamorphically compressed Standard-Definition picture. Typically, devices decoding digital Standard-Definition pictures can be programmed to provide anamorphic widescreen formatting, for 16:9 sets, or letterbox and pan & scan formatting for 4:3 sets; however the pan & scan mode can only be used if the producers of the material have included the necessary panning data, if this data is absent, letterboxing will be used instead.