| 摘要 |
PROBLEM TO BE SOLVED: To obtain a zoom lens being an ultra-high variable power zoom lens whose power variable ratio is >=6, capable of remarkably achieving its effect, having high performance, made compact and constituted of a comparatively small number of lenses by constituting a 2nd group of plural independent single lenses, and constituting a 4th group of a front group consisting of a positive single lens and a rear group where a positive lens is arranged nearest to an object side. SOLUTION: A 1st group G1 is constituted of a positive bonded lens obtained by bonding a negative lens and a positive lens, and a positive single lens. The 2nd group G2 is constituted of plural single lenses, that is, a negative single lens, a negative single lens, a positive single lens and a negative single lens. A 3rd group G3 is constituted of a positive single lens and a positive single lens and a negative single lens. The 4th group G4 is constituted of the front group F consisting of the positive single lens and the rear group R where the positive lens (positive single lens) is arranged on the object side and a negative single lens is arranged on an image side, that is, a positive single lens and a negative single lens. Thus, the lens whose variable power ratio is about 5 to 6 and which consists of a small number of lenses is obtained.
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