For many, many years, the most popular movie format was known as the 35 mm format. This measure indicates the width of the film, including perforations drag. The frame size was 24 x 36mm, which gives a diagonal of 43 mm. .
In 1966 he introduced a revolutionary film format known as Advanced Photography System (APS) that incorporated many new features. Among the most important, the possibility of developing the film without removing the casing and the ability recording, on magnetic media adhered to the edges of the film, information about the camera and the (a precursor of the EXIF \u200b\u200bdata).
The APS film width, including perforations, was 24 mm and the frame size of 16.7mm x 30.2mm was something less than the 35 mm format. Here the bias was about 39 mm.
From the point of view of the subsequent history of photography, the most momentous was the possibility that the photographer could choose, for each frame, the proportions of film prints for the final print. There were three options
APS-C:
proportions 3:2 (Classic)
25.1mm. x 16.7 mm.
Diagonal: 30.1
APS-P:
2.5:1 Ratio (Widescreen)
30.2mm. x 9.5 mm
APS-H:
ratios 16:9 (High Definition (HD))
30.2mm. x 16.7 mm.
photographer, when he took the picture, impressed the entire surface of APS, but could decide to "despise" a part of the socket.
Manufacturers of digital SLR cameras, at the beginning of the first decade of the century, decided to use measures such as APS-C size standard (with minor variations) for their sensors. In recent years, Some manufacturers began to use sensors with a size similar to the old format and 35mm format sensors called Full. The rest is history all more or less already know.
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