Zoom lens of rear focus type

Details Zoom lens of rear focus type Zoom lens of rear focus type

1994-04-22

1996-06-25

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

055305920

ABSTRACT:
A zoom lens is disclosed comprising, from front to rear, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power, wherein the back focal distance is made long by giving proper ranges for the refractive powers of the lens units and with the use of a technical idea on the zooming and focusing movements of the lens units.

REFERENCES:
patent: 5341243 (1994-08-01), Okuyama et al.

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