Zoom lens of rear focus type and image pickup apparatus

Details Zoom lens of rear focus type and image pickup apparatus Zoom lens of rear focus type and image pickup apparatus

1998-06-30

2000-07-04

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359684, 359686, 359715, 359740, G02B 1514

Patent

active

060847220

ABSTRACT:
A zoom lens of the rear focus type having an increased range with the back focal length long enough to accommodate a color separation prism, includes, in order from an object side to an image 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 and a fourth lens unit of positive refractive power, the second and the fourth lens units moving axially to effect zooming and the fourth lens unit moving axially to effect focusing, wherein the second lens unit is constructed with a negative first lens, a negative second lens, a negative third lens and a positive fourth lens.

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