1、REPLACEMENT: This microscope objective lens adapter ring can replace damaged or worn out RMS to filter threaded adapter ring, effectively extend the service life. 2、PHOTOGRAPHIC ACCESSORY: Suitable for macro lenses or telephoto lenses, it can realize autofocus and help to capture clearer details. (The disadvantage is that the focusing distance is shorter) 3、RMS THREADED ADAPTER RING: When imaging, whether or not full frame imaging is possible is related to the DSLR camera chip and the focal length of the objective lens imaging. If the imaging chip is bigger, the focal length needed is a bit longer. 4、CAMERA ADAPTER RING: It can also be used as a camera adapter ring, compact and easy to carry, can be used as a present for lab friends or friends who use video cameras. 5、EASY TO INSTALL: It is made of sturdy anodized aluminum construction, which is sturdy. Smooth surface, easy to install, can easily connect the camera and RMS interface objective lens.