How big is APS-H? I always thought Quan Huafu was APS-H.

Full format is really for APS-C format.

In digital cameras, all 35mm films used in 135 cameras are called full frames.

When it comes to APS-C, you have to say APS, advanced imaging technology. Advanced photographic system (APS) is a new generation of photographic system specification different from 35mm film system, which was introduced by Kodak, Fuji, Canon, Minolta and Nikon on 1996.

The advanced photography system adopts 24mm film, the film area is 16.7mm x 30.2mm, and the film adopts a dorp-in cassette without manual loading. The cassette of advanced photography system marks the state of film, which has four states: unexposed, partially exposed, fully exposed and developed. Support to take it out and put it in the middle of shooting. Advanced photography system supports information exchange system. Film not only records image information, but also records exposure settings, which can be adjusted by the development system. When shooting, the photographer can set three frame settings: standard (C 2:3), HDTV (H 9: 16) and panorama (P 1:3). This setting will also be saved in the film, and 4*6, 4*7, 4 * 168 can be developed automatically when developing. After the film is developed, it will be put back in the box to facilitate the storage of the negative. When developing again, you can tell the print shop the photo number (the photo number can be obtained from the index film and printed on the back of the photo).

APS is called advanced photo system, which is a new type of film after 135, but its life is short. Because of the appearance of digital cameras, they were quickly eliminated.

The full size of APS film is 30.3×16.6 mm.

The negative size of ordinary 135 photos is 36× 24 mm

There are three sizes of APS film: C, H and P. The H type is Quan Huafu (30.3× 16.6 mm), the C type covers one end at the left and right ends of Quan Huafu, but the aspect ratio is 3:2, and the P type covers one piece at the upper and lower sides of Quan Huafu, so the aspect ratio of the picture is 3: 1, which is called panoramic mode. Using this standard, DSLR calls 22.5 x 15.0 mm and 23.6 x 15.8 mm, which are close to C and APS-C frames. 28.7 x 19. 1 mm is probably called APS-H frame.