| 摘要 |
PROBLEM TO BE SOLVED: To provide a rear focusing type zoom lens, favorably correcting various aberrations and attaining compatibility between super wide angle and high magnifying power. SOLUTION: This rear focusing type zoom lens includes in order from an object side: a positive first group G1 being fixed; a negative second group G2 moving to the image plane side along the optical axis during zooming from a wide angle end to a telephoto end; a third group G3 fixed in the optical axis direction; and a positive fourth group G4 in the optical axis direction to correct image plane variation being caused by zooming and perform focusing. The first group G1 includes an eleventh group G1A having a negative power as a whole and a twelfth group G1B having a positive power as a whole. The eleventh group G1A includes in order from the object side: a negative meniscus lens G11 with a convex directed toward the object side, a negative lens G12, a positive lens G13, and a negative lens G14. COPYRIGHT: (C)2009,JPO&INPIT
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