1. High-precision focusing tube, fast focusing, high intensity, good stability, can experience the wonderful experience brought by the lens 2. Easily adjust the focus, change the length of the lens, rotate the focus, change the push and pull effects of the scene range, and focus accurately 3. Copper core aluminum body, high compatibility, using precision CNC machine tools, fine workmanship, copper core aluminum body, wear-resistant and -resistant, 4. Inner wall paint, matting treatment, inner wall paint matting treatment, so as not to reflect light on the CMOS and avoid affecting imaging 5. Accurately in place (manual) manual focus can quickly focus on the exact position, shorten the focus stroke, focus in , manual focus advantages: avoid inaccurate focus under the conditions of backlight, lens compatibility, macro, etc. Function: adapter ring Model: CRX- Main purpose: used to mount CRX lens to Colour:Black Material:metal Size:46mm Package Contents: 1* Lens Adapter Ring Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.