Importance

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Abstract

A zoom lens includes in order from an object side, a zoom lens unit that moves during zooming, and an aperture stop; and a relay lens unit that does not move for zooming, and the relay lens unit includes an extender lens unit changing a focal length range of the zoom lens by entering into and leaving from an optical path of the zoom lens, and that unit includes front, middle, and rear lens sub-units each including one positive lens and one negative lens. The following expressions are satisfied:

description='In-line Formulae' end='lead'0.250<Nn−Np; description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'|fbp/fb|<0.200; anddescription='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'|fbn/fb|<0.200,description='In-line Formulae' end='tail'

where Np and fbp denote a refractive index and a focal length of the positive lens, Nn and fbn denote a refractive index and a focal length of the negative lens, and fb denotes a focal length of the middle lens sub-unit.

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First Claim