Traditional Culture Encyclopedia - Photography major - What kinds of gray patches are commonly used in cameras, and what shooting environment are they suitable for?

What kinds of gray patches are commonly used in cameras, and what shooting environment are they suitable for?

Three kinds.

There are three common types: ND2, ND4 and ND8, which respectively represent that the shutter speed can be reduced 1, 2 and 3. When shooting, reducers are generally classified according to density, and the commonly used density values are 0.3, 0.6 and 0.9.