Museum of the Broadcast Television Camera

Marconi Mkviiip Television Camera diascope

Marconi B3250 MkVIIIp Television Camera diascope
The slide in the diascope projects a special line up pattern into the camera so that the automatic line up circuits can align the tube registration. This is done in the MkVIII camera CCU and is the same as for the studio MkVIII camera. The diascope connects to the iris servo circuit which adjusts the bulb brightness.

The same diascope housing is used for the Marconi MkIX camera, but with a different pattern on the slide.