Traditional Culture Encyclopedia - Photography major - What kind of lens minimum aperture can be opened to F64?

What kind of lens minimum aperture can be opened to F64?

None of the mass-produced lenses on the market can open to f64, which is the aperture made by some photographers. This aperture can produce a wide depth of field, and almost no object in the picture is unclear. The representative figures are ansel adams's "f64 Group" and his masterpiece "The Moon and the Hemidome".