What's the difference between APS-C and APS-H and Quan Huafu?

First, the contents of the included dimensions are different: 22.5 x 15.0 mm, 23.6 x 15.8 mm, 23.7x15.6mm, and 22.2x14.8mm with CCD dimensions close to APS-C are all called APS-C frames; The 28.7x1mm of EOS- 1D and 1DMkII are called APS-H frames; Quan Huafu refers to 36×24mmd 135 film.

Second, the aspect ratio is not exactly the same: the aspect ratio of Quan Huafu and APS-C is 3: 2; The length-width ratio of APS-H is 3:2 or 3.6:2.

Third, the focal length conversion coefficient is different: the focal length conversion coefficient of APS-C is 1.6 or1.5; The focal length conversion coefficient of APS-H is1.3; The focal length conversion coefficient of Quan Huafu is 1.0.

Extended data

The frame of 1.APC-H is one circle less than that of Quan Huafu (see photo), and this circle is the part with the worst resolution among all shots, which is undoubtedly a silver lining for every dark cloud. The magnification of 1.3 has much less influence on the lens focal length than that of 1.6. 24-70 becomes 3 1.2-9 1, and the magnification of APS-C 1.6 makes the focal length of the whole lens very embarrassing, for example, 28- 135 becomes 44.8-2 16.

2. The biggest difference between 2.APS photographic film and traditional photographic film is that the film is not only coated with emulsion, but also coated with a transparent magnetic medium. APS photographic film not only has all the functions of traditional film, but also has the ability of digital writing. By using the perforated edge and the strip-shaped guide rail area on the other side of the film, the relevant data in the shooting process can be recorded on the film at any time.

References:

Baidu encyclopedia -APC-H