To provide a satisfactorily compact zoom lens of excellent optical characteristics, the lens which has a power variation ratio of about 3, and is improved in terms of a manufacturing error and reduced in manufacturing cost.
The zoom lens is constituted of a 1st negative lens group G1, a 2nd positive lens group G2 and a 3rd positive lens group G3, wherein the power is varied by varying a distance between respective lens groups. The 1st lens group G1 is constituted of two negative and positive lenses, the 2nd lens group G2 is constituted of two positive lenses and one negative lens, the 3rd lens group G3 is constituted of one positive lens. Provided that n1 denotes the refractive index of the negative lens in the 1st lens group G1, n2 denotes the refractive index of the positive lens in the 1st lens group G1, n1>1.8 and n2>1.8 are satisfied.
| JP2002277740A | 2002-09-25 | |||
| JP2004205813A | 2004-07-22 | |||
| JP2004004765A | 2004-01-08 | |||
| JP2004013169A | 2004-01-15 | |||
| JP2003140046A | 2003-05-14 | |||
| JP2004240222A | 2004-08-26 | |||
| JP2004093647A | 2004-03-25 | |||
| JP2006078581A | 2006-03-23 |
Ryukichi Abe
Hirukawa Masanobu
Norihiko Uchida
Hideo Sugai
Kenji Aoki
Akira Yonezawa