| 摘要 |
An image stabilizer has, in succession from the object side, an objective lens group having at least positive refractive power, variable angle prism having its vertical angle variable, and optical prism, and which satisfies the following condition:-20< nu VAP- nu RP<40,when nu VAP is the Abbe's number of the variable angle prism, and nu RP is the mean value of the Abbe's number of the optical prism.
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