Origin of focusing screen
Origin of reflex camera
Examples from the Web for focusing screen
Historical Examples of focusing screen
It is upon this focusing-screen in the roof that I see the fiducial lines by which I make all the adjustments.
Nothing can be more convenient than the position of this focusing-screen for working purposes.
By slewing the focusing-screen as shown, a very good general focus for every ray may be obtained.
Just outside the camera, and in a line with the focusing-screen, is a clip carrying a vertical needle.