Creative images of flowers, stamps, insects, and jewelry are just among the many collectibles you can take with this +18 diopter lens. Great for medical/dental laboratory work and other scientific applications.To mount: With your camera lens facing you, simply screw the male threads clockwise onto the threaded camera lens (or lens mount, if applicable). Tighten until fully secure, but do not over tighten. Step up rings may be necessary to attach to camera or lens mount. To remove: Reverse the above procedure.