1、[Adjustable Focus] Focusing helicoid adapter supports a 0.4 to 0.6in focusing range and provides a 0.2in adjustable focus distance for lens focusing. Easy to adjust, does not deviate from the axes. 2、[Upgrade Parts] Focus helicoid ring is the best option for zooming in or changing the lens. Provides a focusing system for lenses that do not have a focusing system, or as a macro focus mount. 3、[Anti Reflection] The inner wall of the focusing helicoid adapter is painted and matte treatment, so as not to reflect light on the CMOS and affect the imaging. Enhance your shooting experience. 4、[Prevent Falling] Focusing tube adapter can be tightly connected with the lens, and the high strength screws penetrate deep into the ring body and are not easy to fall off. 5、[Alloy Material] Macro lens ring is made of high quality aluminum alloy material, which is not easy to wear out, and is black anodized for longer service life and comfortable hand feeling.