| 摘要 |
PURPOSE: A thin shape zoom lens with long-focus type is provided to improve an aberration characteristic in all region of a using range by using a master moving method having a composition of 4 groups. CONSTITUTION: A first lens group(10) is composed of 3 spherical lens having a negative, positive and negative refractive indexes from an object, and is fixed to an upper surface(60). A second lens group(20) is composed of 2 spherical lens having a negative and negative refractive indexes from the first lens group(10), and is moved according to an optical axis. A third lens group(30) is composed of 3 spherical lens having a positive, negative and positive refractive indexes from the second lens group(20), and is fixed to the upper surface(60). A fourth lens group(40) is composed of 2 spherical lens having a positive and negative refractive indexes from the third lens group(30), and is moved in a front and rear direction.
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