CHAPTER IV
How to Film — General Rules
Speed :
Regulate the speed, remembering that the normal speed for
projection is 16 frames per second.
Viewfinder-Parallax :
Correct the parallax according to the distance between the
lens and the subject so as to obtain dead accurate centering.
Varying focal length of lenses :
Make sure that the viewfinder is regulated for use with the
taking lens on the turret.
Focussing :
All lenses supplied with the model H camera are fitted with
a focussing ring. This permits them to be regulated to the
distance between the subject and the lens, thus making for
pin-point definition. The nearer the subject to the lens, the
greater must be the care taken to ensure accurate focussing.
More care in focussing is also demanded by large aperture
lenses, particularly when it is necessary to use a large stop.
In case of doubt in the estimation of distance, it is best to
err on the long side. When the subject is moving towards
the camera it is advisable as a general rule to focus for the
nearest spot to which it will approach. On most lenses, the
scale engraved corresponds to a distance measured from
the plane of the film to the subject.
See our depth of focus table.
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