Traditional Culture Encyclopedia - Photography and portraiture - In photography, the first exposure decreases and the first exposure increases. I don't quite understand how this level is calculated. Can you explain it more clearly? thank you

In photography, the first exposure decreases and the first exposure increases. I don't quite understand how this level is calculated. Can you explain it more clearly? thank you

If EV is 1/3 steps, dial 3 times for the first gear; If EV is 1/2 steps, it is twice. General SLR, the default is 1/3 steps.

For the shutter, the difference of /250 1/500 is 1, which is the first level.

Aperture 2.84 5.681116 Two adjacent gaps are one gear.