Feature: 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. Specification: Item Type: Microscope Objective Lens Adapter Ring Material: Aluminum Alloy RMS Thread Depth: 5mm / 0.2in. Package List: 1 x Microscope Objective Lens Adapter Ring Note: To be able to use it, the following conditions are required:1. Make sure your objective lens is RMS thread (20mm or so), such as microscope objective lens (25mm) or objective lens (26mm) (need to be adapted to RMS interface).2. Determine the filter thread of the camera lens.3. Determine the focal length of the lens, for example: 14‑42mm focal length lens, 42mm filter interface, the imaging range is only about 1/4 of the whole picture, long focal length lens will be better.