Patent ID: 6839512

Claim:
A camera device having a posterior filter, comprising a fixed lens barrel having its inner surface formed with a first helicoidal member, an active focusing barrel, for manual adjustment, rotatably disposed about an optical axis over an outer surface of the fixed lens barrel, a revolving barrel rotatably disposed about the optical axis over an inner surface of the fixed lens barrel and having its outer surface formed with a second helicoidal member, the second helicoidal member being cooperatively mated with the first helicoidal member, a coupling element communicating rotary motion of the active focusing barrel to the revolving barrel without conveying linear motion along the optical axis, a holder of a trailing lens(es) fixed to the revolving barrel in unit, a posterior filter holder receiving the linear motion along the optical axis from either the revolving barrel or the trailing lens holder but not the rotary motion from the same and detachably holding the posterior filter, and a rotary motion restriction member built in the fixed lens barrel for impeding the rotary motion of the trailing lens holder.