Depth of field Preview

First you need to understand ~ Why is there a depth of field?
After the fast rolling process has not been followed
In fact, the aperture of the opening head is at the maximum aperture.
In this way, the incoming light volume of the camera is larger than that of the camera.
The warning window is brighter than the warning window.
For the focus Structure
But because it is the maximum aperture ~ So the depth of field you see in the landscape window is too large.
It is also the depth of field shown by the maximum aperture.
You cannot know the depth of field in the aperture you are using
The camera will wait for the instant when the computer is pressed down to minimize the aperture of the camera to the aperture you set.
Because of this, the depth-of-field failover function is available.
Depth-of-field compaction refers to generating the aperture of the camera head to the aperture number you have set.
But ~ It was mentioned at the beginning ~ The relationship between aperture and incoming light
So you press "depth of field ~ The landscape window will also become darker.
At this time, you should pay attention to the depth-of-field attention ~ The difference between the aperture and aperture is displayed.
But sometimes I think the landscape window is too dark ~ It is also not good to confirm