Movies for TV - Early Television Foundation

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FUNDAMENTALS
G. Back, has twenty-eight elements operating inside the barrel. At
once the tremendous value of the lens-coating process so re-
cently developed will be apparent. Without this, the loss of light
in passing through all these lenses would be tremendous, and it
would not be half as effective. As it is, the / value is a maximum of
/ 5.6 with a minimum of / 22. It is thirty inches long and
weighs eleven pounds.
It has an almost infinite number of focal
lengths varying from five inches to twenty-two with a telephoto
front lens and from three to thirteen inches with a wide-angle lens.
This unique lens permits a camera man to cover almost any
feature is
type of shot with only the one lens. The outstanding
the ability to change focus and follow action without losing sharp-
to follow
ness of focus of the subject. In other words, it is possible
action all over the operating area without presenting an out-of-
focus picture and always with a satisfactorily large image in the
frame.