==========High-concerned chemical : NoneBarrel Size : 1.25 inches (31.7 mm)Magnification : 5 XType : Monocular Standard 1.25-inch or 2-inch interface compatible with eyepieces and star diagonals of mainstream telescopes. Internal tube features anti-reflection threads to suppress stray light, improving contrast. Compatible with 1.25-inch universal interface, it has 5X magnification to extend the focal length of telescopes for daily astronomical observing. With apochromatic optical design, it corrects light aberration, optimizes internal light path and reduces imaging interference caused by dispersion. Fully multi-coated lens surface improves light transmission efficiency and adapts to various sky and deep space observation scenarios. Universal Barlow lens structure is compatible with various ordinary astronomical eyepieces to expand matching application scope. It features well-fitted interface and easy installation and removal without any extra auxiliary tools. Threaded locking interface for secure, wobble-free connection. Works with eyepieces and cameras for high-magnification planetary photography or close-up lunar surface imaging. Brand Generic Focus Type Auto Focus Model Name WCACRLBBX Finderscope Reflex Manufacturer Generic Model Number WCACRLBBX Objective Lens Diameter 1 Millimeters Manufacturer Part Number WCACRLBBX Item Dimensions D x W x H 3.94 D x 3.94 W x 3.94 H