Photographic lens system having an auxiliary lens

Details Photographic lens system having an auxiliary lens Photographic lens system having an auxiliary lens

1980-12-24

1983-12-27

Corbin, John K.

350254, G02B 962, G02B 964, G02B 1510

Patent

active

044227345

ABSTRACT:
Disclosed is a lens system having a principal lens, a photographic film and an auxiliary lens which can be mounted between the principal lens and the photographic lens and has a negative refractive power. The auxiliary lens consisting of a first positive lens having a front surface with large radius and a convex rear surface at the image side, a second bi-concave lens and a third positive lens having a convex front surface at the object side and a rear surface with large radius in sequence from the object side, while the axial distance between the first positive lens and the second bi-concave lens is larger than that between the second bi-concave lens and the third positive lens and the second bi-concave lens and the third positive lens have a negative composed refraction power.

REFERENCES:
patent: 3388650 (1968-06-01), Westphalen

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