* This is an optional step - you can remove the viewing system but expect to realign it afterwards.

Olexander warns: "This is very rash procedure too.
If you will remove the ground glass prism, you can destroy of previous adjust of position of mirror disk ( influence on sharpness of image on film ).
You can see, the body of gropund glass prism have adjusting pins, but, from practical side, this position of ground glass after install can be other."