Photographic optical systems with nonrotational aspheric surfaces
1999
Sections of nonrotational aspheric surfaces can be useful in a
variety of optical situations. In several examples, image-forming
objectives, as for photographic or electronic camera products, are
described in which suitably located asymmetric pairs of refractive
surfaces are devised, such that relative rotation about a displaced
axis of one with respect to the other can be used to produce a focusing
effect that is satisfactory for imaging purposes over reasonable fields
of view and for practicable apertures and achromatic
corrections. Taylor expansions about assignable reference points in
any given surface of a sequence, together with suitable coordinate
systems, can be employed to relate performance to shape
parameters.
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