Traditional Culture Encyclopedia - Photography major - Why is the viewfinder blurred after Canon EOS 5D Mark III autofocus?

Why is the viewfinder blurred after Canon EOS 5D Mark III autofocus?

First of all, it is normal. It's all like this.

Why paste it? Because SLR framing is always the largest aperture and the depth of field is very small. You just need to press the black button below the depth of field to understand why.

The diopter of the viewfinder cannot be adjusted.