TELECONVERTER, AND IMAGING SYSTEM COMPRISING THE SAME

摘要

A teleconverter, comprising:
a master lens apparatus-side mount on which a master lens apparatus is mounted,a camera body-side mount on which a camera body is mounted, anda converter lens unit that has a generally negative refracting power for mounting the master lens apparatus thereon to obtain a lens system having a focal length longer than that of the master lens apparatus, wherein:the converter lens unit comprises a first lens group on the master lens apparatus side and a second lens group on the camera body side with an on-axis longest air separation interposed there-between, and does not include any lens group other than the first lens group and the second lens group,the first lens group has positive refracting power,the second lens group has negative refracting power,the first lens group consists of a first lens element having positive refracting power, andthe second lens group comprises, in order from an object side to an image side along an optical path, a second lens element having negative refracting power and adjacent to the first lens element, a third lens element having positive refracting power and adjacent to the second lens element, and a fourth lens element having negative refracting power and adjacent to the third lens element, with satisfaction of the following condition (3):;0.04D is an on-axis thickness of the converter lens unit.

主权项

1. A teleconverter, comprising:
a master lens apparatus-side mount on which a master lens apparatus is mounted, a camera body-side mount on which a camera body is mounted, and a converter lens unit that has a generally negative refracting power for mounting the master lens apparatus thereon to obtain a lens system having a focal length longer than that of the master lens apparatus, wherein: the converter lens unit comprises a first lens group on the master lens apparatus side and a second lens group on the camera body side with an on-axis longest air separation interposed there-between, and does not include any lens group other than the first lens group and the second lens group, the first lens group has positive refracting power, the second lens group has negative refracting power, the first lens group consists of a first lens element having positive refracting power, and the second lens group comprises, in order from an object side to an image side along an optical path, a second lens element having negative refracting power and adjacent to the first lens element, a third lens element having positive refracting power and adjacent to the second lens element, and a fourth lens element having negative refracting power and adjacent to the third lens element, with satisfaction of the following condition (3):
0.04 D is an on-axis thickness of the converter lens unit.