Ask the SLR viewfinder what it sees is a warm and clear picture, and why there is a little color change and blur after shooting. What is the reason?

First of all, what the viewfinder sees is what you see with the naked eye. It just refracts light for you through the lens and the pentaprism of the reflector, which is different from the photos taken.

As for the color change, it should be that the white balance and the photo effect are not set well. In order to accurately restore the color of the subject, we must first calibrate the white balance with a standard color card before taking a picture, and then accurately expose it, select the standard for the photo effect and reduce the color difference.

Also, there are differences in color display between different screens. For example, if you shoot a person with a Canon camera, the skin color of this person is white and red on the camera screen, but the photo feels a little yellow on the computer.