Photography often says to reduce exposure! How to downshift!

A document is an exposure. In the past, old cameras were all in 1 double tone, so the concept of first gear was used more. Now the camera is fine-tuned to 1/3.

Specifically, adjusting the shutter time and lens aperture can adjust the exposure.

For example, the original shutter = 1/60S, one step of exposure is 1/30S, and one step of exposure is1125s.

If the aperture is originally F5.6, the exposure increase is F4, and the exposure decrease is F8.