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Title:
INNER FOCUS TYPE LENS
Document Type and Number:
WIPO Patent Application WO/2014/069077
Kind Code:
A1
Abstract:
Provided is an inner focus type lens that has such a focal distance that the lens can be used as a standard lens, that enables excellent moving image photographing, that is compact, and that has excellent imaging performance. This inner focus type lens is composed of a first lens group (G11) that has an aperture stop (S) and a positive refractive power, a second lens group (G12) that has a negative refractive power, and a third lens group (G13) having a positive refractive power, which are arranged in this order from the object side. This inner focus type lens performs focusing by moving the second lens group (G12) along the optical axis. The third lens group (G13) includes a positive lens (L131) having a function as a vibration-proof group. When this inner focus type lens satisfies predetermined conditions, an inner focus type lens is realized that can be used as a standard lens in moving image photographing, that is compact, and that has excellent imaging performance.

Inventors:
SAKAI TAKAHIKO (JP)
Application Number:
PCT/JP2013/072331
Publication Date:
May 08, 2014
Filing Date:
August 21, 2013
Export Citation:
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Assignee:
TAMRON KK (JP)
International Classes:
G02B13/00; G03B5/00
Foreign References:
JP2012027349A2012-02-09
JP2012189637A2012-10-04
JPH09236744A1997-09-09
JPH09236742A1997-09-09
JP2000227546A2000-08-15
JP2012002999A2012-01-05
JP2006058840A2006-03-02
JP2013161076A2013-08-19
Attorney, Agent or Firm:
SAKAI, AKINORI (JP)
Akinori Sakai (JP)
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