| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel capable of restraining the lowering of peripheral light quantity to be small with a simple constitution. SOLUTION: The lens barrel is equipped with an optical system having the focal distance of a wide angle area, and has the lens to which ND coating is applied. It is desirable to make the density of the ND coating get lower and lower toward the outer periphery from the center of the lens to which the ND coating is applied, and it is more desirable to compose it of two or more kinds of density parts. COPYRIGHT: (C)2004,JPO&NCIPI
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