- See under reflex camera.
Origin of focusing screen
- a camera in which the image appears on a ground-glass viewer (focusing screen) after being reflected by a mirror or after passing through a prism or semitransparent glass; in one type (single-lens reflex camera), light passes through the same lens to both the ground glass and the film, while in another type (twin-lens reflex camera), light passes through one lens (viewing lens) to the ground glass and through a second lens (taking lens) to the film, the lenses being mechanically coupled for focusing.
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.
- a camera in which the image is composed and focused on a large ground-glass viewfinder screen. In a single-lens reflex the light enters through the camera lens and falls on the film when the viewfinder mirror is retracted. In a twin-lens reflex the light enters through a separate lens and is deflected onto the viewfinder screen