Rear-focus type zoom lens with movable second and fourth lens un

Details Rear-focus type zoom lens with movable second and fourth lens un Rear-focus type zoom lens with movable second and fourth lens un

1994-04-21

1996-12-10

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359684, 359708, G02B 1514

Patent

active

055836976

ABSTRACT:
A rear focus type zoom lens including, in succession from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power having a stop, the third lens unit having at least two positive lenses and a negative lens which is most adjacent to the image plane side, and a fourth lens unit of positive refractive power consisting of a positive lens and a negative lens, the second lens unit and the fourth lens unit being moved to effect zooming, the fourth lens unit being moved to effect focusing.

REFERENCES:
patent: 4818083 (1989-04-01), Mihara
patent: 5009492 (1991-04-01), Hamano
patent: 5056900 (1991-10-01), Mukaiya et al.

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