Zoom lens and imaging apparatus
AssigneeTamron Co., Ltd.
InventorTomohiro KOBAYASHI
Life of this patent
Estimating the term…
Abstract
A zoom lens has a plurality of lens groups and is a zoom lens that zooms from the wide-angle end to the telephoto end by changing the distance between adjacent lens groups, and has an aperture stop and at least one focus group each on the object side and the image side with the aperture stop therebetween, and when focused from infinity to a close object, the focus groups move along the optical axis, and the focus group arranged on the object side closer than the aperture stop includes at least one lens, and the lens satisfies the predetermined conditional expression. In addition, an imaging apparatus includes the zoom lens.
Claims11
A zoom lens including a plurality of lens groups and zooming from a wide-angle end to a telephoto end by changing a distance between adjacent lens groups, the zoom lens comprising:
- an aperture stop;
- and
- at least one focus group each on an object side and an image side with the aperture stop between the object side and the image side, wherein
- when focused from infinity to a close object, each of the focus group moves along an optical axis, and a focus group Fa arranged on an object side closer than the aperture stop includes at least one lens La, and
- the lens La satisfies a following conditional expression:
- va
- >
- 60
- (
- 1
- )
- here,
- va is Abbe constant relative to the d-line of the material forming the lens La.
Dependencies are inferred from the claim text.