| 摘要 |
To provide a front tele-converter that may cause less aberrations and has a superior imaging quality though it has a high magnification, disclosed is a front tele-converter TC having an afocal magnification higher than 1.9, which is detachably mountable to a photo-taking lens L on its object side. The front tele-converter has, in order from the object side, a positive lens group GF having a positive refractive power and a negative lens group GR having a negative refractive power. The positive lens group GF has a positive cemented lens, the negative lens group GR has a positive lens with its convex surface facing the image side, a vibration-reduction lens group GV comprising a lens group consisting of part or the whole of the negative lens group GR and having a negative refractive power is movable in a direction disposed at substantially right angles with the optical axis to effect vibration reduction, and the lens groups fulfill a specific condition.
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