What does the EV value of photography mean?

Ev: (exposure value) value: exposure value. 1EV corresponds to twice the exposure ratio, which is usually called "first stop".

Shutter priority is similar to aperture priority. The shutter speed is set manually, and the aperture size is automatically matched by the camera. Generally speaking, if you shoot manually, the shutter speed should not be lower than 1/60 seconds.

Otherwise, it is easy to hold the camera unsteadily and blur the picture. Of course, if you have enough power or use a tripod, you don't have to worry about stability. On digital cameras, shutter priority is generally represented by "S".

The EV value can be calculated as follows:

EV value = shutter index TV value+aperture index AV value (in the case of ISO 100).

For example, the actual EV value measured by the metering system is 15. You can choose to use shutter 1/30(TV value is 5) with an aperture of f32(AV value is 10) or shutter1125 (TV value is 7) with an aperture of F65438+. It can be used reasonably according to the actual situation.

Exposure is a combination of different shutters and apertures, which achieve the same exposure, but they are suitable for different shooting environments and shooting effects. For example, if you use the shutter of 1 1 25 seconds and the aperture of f11in sunny conditions, you will get the same exposure as the shutter and aperture of 1/250 seconds and f8 respectively.