Black and white photographic tone

Your question is given too few points, and there are too many words to type.

Just answer a question about tolerance,

First of all, the tolerance of black-and-white photography has been completely exploded by Quan Huafu digital cameras.

The same film, in the hands of others, only has a seven-level tolerance, and in Adams' development disk, there is a 10 tolerance.

In the digital age, in February, 2007, Pentax released the Pentax 645D integrated medium format digital camera. The manufacturer announced for the first time that its dynamic range reached 12, and the Canon 5DII with normal aperture was 1 1, which easily reached the level of Adams.