Museum of the Broadcast Television Camera

Pye Diascope for Mk3 Television Camera

Pye Diascope for Mk3 Television Camera

This is the 843324 diascope unit made to fit the Pye Mk3 Image Orthicon Camera. Shown is the underscan/overscan slider adjustment.

 

Overscan as applied to the tube scan size is used whilst not on "transmission" so that the tube target darkening (burn) caused by use is larger than the area used for transmission.

 

The underscan markings on the diascope enable these two scan sizes to be set.