A fisheye lens system with a half angle-of-view of 90.degree. includes a negative front lens group, a diaphragm, and a positive rear lens group.The negative front lens group includes at least three negative meniscus lens elements each of which has the convex surface facing toward the object; and the three negative meniscus lens elements satisfy the following conditions: 0.2

 
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> Kinematic mount having connectors with beveled edges

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