Traditional Culture Encyclopedia - Photography major - On the problem of photographic focus ratio

On the problem of photographic focus ratio

The following 1 1, 16 are the depth of field scales, the focus scale is in the middle distance window, and the distance where the thick white line in the middle of the depth of field scale is aligned is the current focus distance. At present, as long as the lens is not too bad, there will always be a focus scale, and the depth of field scale is only available if there is a focus scale.