| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a photographing optical system whose constitution is small-sized, whose optical performance is excellent, whose aberration fluctuation is reduced and which is suitable for the image pickup unit of a digital still camera and a mobile phone or the like. SOLUTION: A lens group that includes an aspherical surface arranged closest to the image side and is always fixed and a focusing group movable for focusing just before the lens group arranged closest to the image side are arranged.</p> |
