| 摘要 |
A shielding device for shielding a clearance between a frame member having an opening and a tube member received in the opening and movable substantially in the direction of an optical axis. The shielding device comprises an annular shielding member arranged between the inner circumference of the opening of the frame member and the outer circumference of the tube member. The annular shielding member is so slidably fitted on the tube member that its inner circumference may contact with the outer circumference portion of the tube member, and is either given substantially the same color as that of the outer circumference surface of the tube member or made substantially transparent at least at its portion having contact with the tube member.
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