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High variable power zoom lens

A variable focus lens, variable technology, applied in the direction of optical components, optics, instruments, etc., can solve the problems of reduced productivity, unfavorable focus of zoom lens, low magnification of the third lens group, etc.

Active Publication Date: 2011-06-15
TAMRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the variable magnification of the zoom lens is increased to 13 times, in some cases, it will disadvantageously cause the zoom lens to focus at the changed focal length, thereby reducing the magnification of the third lens group to as low as -1 times
In addition, the third lens group becomes more sensitive to aberrations, and dealing with this hinders and reduces productivity

Method used

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  • High variable power zoom lens
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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0094] Preferred embodiments of the high variable magnification zoom lens according to the present invention will be described below.

[0095] Focal length f=18.40~71.10~264.21mm

[0096] Fno=3.50~5.24~6.32

[0097] 2ω=76.5~23.1~6.3°

[0098] Number R D Nd vd

[0099] 1 94.3524 1.5000 1.84666 23.78

[0100] 2 66.4807 8.0000 1.49700 81.61

[0101] 3 -1326.8193 0.2000 1.00000

[0102] 4 72.3127 4.5000 1.61800 63.39

[0103] 5 180.4067 D5 1.00000

[0104] 6 90.3327 0.2000 1.51460 49.96

[0105] 7 83.8997 1.2000 1.80400 46.58

[0106] 8 14.845 6.4000 1.00000

[0107] 9 -34.8049 1.0000 1.80400 46.58

[0108] 10 47.2288 0.8000 1.00000

[0109] 11 34.7194 4.8000 1.84666 23.78

[0110] 12 -33.6597 1.2000 1.00000

[0111] 13 -25.046 1.0000 1.88300 40.78

[0112] 14 -207.5416 D14 1.00000

[0113] 15 0.0000 1.0000 1.00000

[0114] 16 37.3663 1.0000 1.84666 23.78

[0115] 17 26.4946 4.0000 1.48749 70.21

[0116] 18 -1075.5953 0.2000 1.00000

[0117] 19 32.6392 3.2918 1....

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PUM

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Abstract

A compact and lightweight, high variable power zoom lens especially suitable for single-lens reflex digital cameras, which is 75 degrees or even wider in field angle at the wide-angle end, approximately 3 to 4 in F-number at the wide-angle end and approximately 6 to 7 at the telephoto end, and about 15x in variable power ratio. The zoom lens of four groups of lens pieces respectively exerting positive, negative, positive, and positive refractivities varies the power from the wide-angle end to the telephoto end as a result of the 1st and 2nd lens groups being split more, the 2nd and 3rd lens groups coming closer to each other, and the 3rd and 4th lens groups also coming closer to each other. The 3rd lens group has the leading set of lens pieces of positive refractivity closer to objects and the trailing set of lens pieces of negative refractivity, and the trailing set alone are moved to be orthogonal to the optical axis to compensate for defocus in the imaging plane caused by a tremor of the user's hand(s). The 2nd lens group are displaced closer to objects for the focusing.

Description

technical field [0001] The present invention relates to a high variable power zoom lens suitable for a single-lens reflex camera, and more particularly, to a compact and lightweight high variable power zoom lens capable of Sufficient back focal length (back focal length), suitable for single-lens reflex cameras, and has advantages in incorporating an optical stabilizer or anti-shake mechanism, the zoom lens has an angle of view of 75 degrees or wider at the wide-angle end, and has an angle of view at the wide-angle end The F-number at the telephoto end is about 3 to 4, and the F-number at the telephoto end is about 6 to 7, and the zoom ratio is about 15 times. Background technique [0002] Recently, rapid advances in optical design technology and optical manufacturing technology have made zoom lenses smaller in size and improved in variable magnification. For example, one type of zoom lens in the prior art has a design that increases the variable magnification and can incor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/16
Inventor 荒川明男村松雄一
Owner TAMRON