About EV value

To put it simply, EV value is an indicator of brightness. The higher the EV value, the brighter the light. The lower the EV value, the darker it is.

The same EV value can have different exposure/shutter combinations. Adjust this to control depth of field.

It’s a lot to say in detail. You can refer to some introductions to photography introductory books. This is an important concept. Whether it is a traditional or digital camera, there are concepts that need to be understood.