Fisheye lens having a short distance compensating function

Details Fisheye lens having a short distance compensating function Fisheye lens having a short distance compensating function

1993-03-19

1995-07-18

Sugarman, Scott J.

Optical: systems and elements

Lens

Panoramic

359755, 359762, 359770, G02B 1306, G02B 960, G02B 962, G02B 964

Patent

active

054347130

ABSTRACT:
A fisheye lens comprises sequentially from an object, a first lens group including a negative meniscus lens and a second lens group having positive refracting power. The first and second lens groups move on the optical axis toward the object. The fisheye lens incorporates a short distance compensating function for focusing from an infinity object point onto a short distance object point by expanding n air space between the first and second lens groups and further satisfies various conditions.

REFERENCES:
patent: 3524697 (1970-08-01), Isshiki et al.
patent: 3589798 (1971-06-01), Ogura
patent: 3597049 (1971-08-01), Ogura
patent: 4957355 (1990-09-01), Sato

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