Aiming device

An aiming device comprising:

• a tubular support housing;
• an adjustable iris diaphragm arranged in said housing at one end thereof and forming an eyepiece, said diaphragm consisting of an axially slotted sleeve forming ribs which are bent inwardly at their free ends, said inwardly bent free ends overlaying each other scale-like and being received in a conical opening in said housing;
• a rotatable operating ring threaded onto said housing and engaging said slotted sleeve for axially forcing said sleeve with its free ends into said conical opening for causing inward deflection of said free ends for adjustment of the opening of said eyepiece;
• a polarizing filter structure also mounted in said housing and consisting of two adjacent polarizing discs rotatably mounted relative to each other by 90.degree., each being supported on an operating lever, the first one being linked to said housing, and a polarizing filter control ring rotatably supported on said housing and having the end of the second polarizing filter operating level linked thereto for rotating said polarizing filters relative to each other, said filter control ring further having means for engaging the first operating lever for pivoting said lever to move the filters out of line of sight of said aiming device and a color filter disc including a number of different color filters and provided with external gearing and an operating ring mounted rotatably around said housing and provided with internal gearing in engagement with the gearing of said filter disc, and said filter disc being rotatably supported by rollers disposed in an area opposite the area of engagement of said gearings so as to permit operation thereof, all three rotatable operating rings, the color filter disc operating ring, the polarizing filter support lever operating ring and the iris diaphragm operating ring being disposed axially closely adjacent one another and rotatably around said housing.