I found quite by accident this extension here on Amazon; and previously resigned myself to that I never can see the entire contents of the finder of my Canon D600. But finally, this chic part reduced the entire viewfinder area although by a factor of 0.7, and the screen looks smaller. But as compensation get glasses finally see the entire image area with all digital information in the viewfinder (without having to always press the nose on display).
For eyeglass wearers also: indispensable!
Greetings
Thomas
