Abstract
This paper proposes an analytical calculational technique for a uniform iris with an aperture of
elliptical shape. The purpose of the device is to regulate the depth of sharply imaged
space. Anamorphic objectives are not suitable for this, because the depth of field is different in
the vertical and horizontal directions. The technique is based on an original theory of
envelopes, which in this case considers the working face of the leaf of the iris that coincides
with a curve that envelops a family of ellipses that open out to a certain angle relative
to the fixed pin of the iris leaf.
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