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May, 1951
BOWEN, MOIR AND TURNER: TELEKINEMA SOUND EQUIPMENT
143
Optimum Presentation
The requnement for optimum presentation of the picture detail and colour is clearly that it should be presented against a neutral background such that the highlights are always brighter and the dark shadows blacker than the surround. These conditions are satisfied by projecting the surround lighting from the film projector in such a manner that the surround intensity and
beam and slightly above it. After passing through a heat filter the light is directed by a condenser lens on to a full frame size aperture in the position normally occupied by the framing aperture, and passing through the film is modulated in intensity and assumes the colour of the picture. The colour content of the transmitted light is then defocused or diffused to give a uniform colour, masked to present the desired shape
Fig. I. Standard SUP A Projector modified for the Telekinema. The Optical System for the projected picture surround appears above the Standard Optical System. The disc carries the Polaroid and Neutral Filters. Anti-vibration mountings have been added to the feet as the machines are mounted immediately above the audit nee.
colour is the average intensity and colour of the picture at all times.
In the new equipment this is achieved fairly simply (see Fig 2), by making use of the light normally wasted during the pulldown period when the shutter is closed. The standard shutter is replaced by a special shutter with reflecting rear surface to direct the light normally wasted, upwards to a second mirror which reflects the light forward in abeam approximately parallel to the picture
and projected by a corrected lens system which focuses the mask on the screen.
All the requirements of a perfect background are thus secured in a surprisingly simple manner; the average intensity and colour of the surround can be related in any desired ratio to the picture and is automatically maintained without any manual control.
It cannot be emphasized too strongly that the purpose of a projected surround is not to compete with the picture for the patrons'