A triple-ring lens filter holder, comprising:
- a front retaining ring having:
- a connection portion annularly formed on and axially protruding from a rear portion of the front retaining ring;
- and
- a rear flange annularly formed on and radially and outwardly protruding from an outer side of the connection portion, and having:
- an outer surface;
- a front surface;
- a rear surface;
- and
- a first outer bevel surface formed between the rear surface and the outer surface of the rear flange and obliquely and outwardly extending from the rear portion of the front retaining ring;
- a middle retaining ring being resilient, annularly mounted on a periphery of the front retaining ring, and having:
- a shoulder portion radially extending and having an outer edge and an inner edge;
- a sleeve portion axially extending from the outer edge of the shoulder portion to a front portion of the middle retaining ring;
- an inner flange annularly formed on and radially and inwardly extending from an inner side of the sleeve portion, engaging the rear flange of the front retaining ring, and having:
- an inner surface;
- a front surface;
- a rear surface;
- and
- an inner bevel surface formed between the front surface and the inner surface of the inner flange and obliquely and outwardly extending from a rear portion of the middle retaining ring;
- an abutment portion axially and forwardly extending from the inner edge of the shoulder portion to the rear portion of the middle retaining ring;
- and
- an outer flange annularly formed on and radially and outwardly extending from an outer surface of the abutment portion, and having:
- an outer surface;
- a front surface;
- a rear surface;
- and
- a second outer bevel surface formed between the rear surface and the outer surface of the outer flange and obliquely and forwardly extending from the rear portion of the middle retaining ring;
- and
- a rear retaining ring being resilient, annularly mounted on a periphery of the shoulder portion of the middle retaining ring, and having:
- a positioning portion annularly formed on and axially extending from a rear portion of the rear retaining ring;
- and
- a rear flange annularly formed on and radially and inwardly extending from an inner side of the positioning portion, engaging the outer flange of the middle retaining ring, and having:
- an inner surface;
- a rear surface;
- and
- a front bevel surface connected with the inner surface of the rear flange, facing a front portion of the rear flange, and obliquely and forwardly extending from the inner surface of the rear flange.