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MANAGERS AND PROJECTIONISTS 295
distinguish the individual leaves, and how the detail of the bark begins to show.
Precisely the same thing which was true of the tree is true of the picture on the screen as observed by the projectionist only, due to difficulty of looking through a comparatively small opening in the wall of an all too often well lighted room, the detail of the foliage of the actual tree will appear much more clearly than will the detail of the image of the same thing on a screen, distance being equal.
It therefore follows that distance of screen from projection room is of vital importance, since if the distance be too great the projectionist will not have a clear view of the detail of the picture, hence will be unable to judge of the fine sharpness of focus, and sharpness of focus is of vital importance, since it has intimately to do with eye strain.
Many exhibitors permit the establishing of an abnormally long projection distance, and then try to compensate for the poor view the projectionist has of his screen by providing an opera glass. This latter is, of course, an excellent thing to do, even with a short projection distance, because there are times when the projectionist will wish to observe the screen very closely, but to attempt to compensate for a toolong projection distance thus is in the nature of a makeshift, and one which is only partly successful, because a projectionist just simply will not use a glass as often as would be necessary for the best possible results.
It is just plain common sense that the picture should be kept in as sharp focus or definition as possible.
It is also just plain common sense that if the projection room is so far from the screen that the projectionist cannot see the finer details of his picture clearly and sharply, the picture will not be in constant sharp focus, or at least not in the sharpest possible focus.
Oh yes, we grant you the projectionist can use an opera glass, but, as we before said, he won't, at least not with sufficient regularity to insure 100 per cent, sharpness.
It therefore follows that for best results (and any other than best results will inevitably react to the injury of box office receipts) the projection room must not be placed too far from the screen. But to determine the maximum permissible limit of distance is a difficult matter. Perhaps it may be best disposed of by saying that beyond seventy-five feet the view of the picture from the projection room can