Imaging system for macrophotography

Details Imaging system for macrophotography Imaging system for macrophotography

1990-04-27

1991-11-26

Perkey, W. B.

Optical: systems and elements

Prism

With reflecting surface

35419512, 359740, G03B 902

Patent

active

050686798

ABSTRACT:
An imaging optical system having a photographic lens and a mechanical stop is provided with a variable focal length lens disposed adjacent to a mechanical stop and having a diameter smaller than a maximum diameter of a beam of light capable of traversing the mechanical stop when opened. Further, the imaging optical system may be provided with a physical stop capable of changing transmittance in an electric field or a magnetic field and constructed so that a maximum diameter of a light-blocking portion is smaller than that of the beam of light capable of traversing the mechanical stop when opened. Consequently, adjustment of the amount of light in ordinary photography and macrophotography is properly made and a camera with low cost is secured.

REFERENCES:
patent: 4333720 (1982-06-01), Suzuki et al.
patent: 4927241 (1990-05-01), Kuijk
patent: 4934790 (1990-06-01), Hohenecker

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