| 摘要 |
PURPOSE: A fisheye lens is provided to constantly maintain a gap between lens parts on a first optical tube and a second optical tube by including an optical tube gap adjuster which connects the first optical tube and the second optical tube. CONSTITUTION: A fisheye lens(200) includes a plurality of lens parts which is arranged to an optical axis direction. A part of lens parts which is adjacent to an object is installed to a first optical tube(210). Other lens parts are installed to a second optical tube(220). The lens parts on the first optical tube are first lens units. The convex surface of the first lens units are toward to the object.
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