Features 1、Sharp Image: 30MM large aperture ensures sufficient light intake, offering brighter imaging that allows you to see planets and stars in the pitch black night sky. It can prevent irritating reflections can bring you bright and clear images 2、Adjustable Focus: F4 aperture optics provides a very wide field of view which will help to quickly find the target when performing astronomical observations, using helical focuser, 9mm travel distance, allows for accurate focusing, providing clearer target images. 3、Comfortable Observation: Positive design brings more comfortable observation angle and improves the finder scope experience, not tired of using it for a long time. Fine workmanship bringing you visual enjoyment. 4、Sturdy Construction: Aerospace grade aluminum alloy support, CNC integrated molding process, rust resistant, with standard 1.25 inch interface and M42x0.75 thread compatible with standard eyepieces and electronic eyepieces. 5、Fully Coated Green Film: Fully coated high definition green film, improve light transmission, can provide a clear and crisp night sky view, clear images can facilitate you to quickly find the target. Specification Item Type: 30mm F4 Finder Scope Material: Aluminum Alloy, Optical Glass Lens Diameter: 30mm Coating: Green Film Lens Coating: Fully Multi Coated Interface Type: Inner 1.25 Inch Interface, Outer Interface M42x0.75 Thread Package List 1 x 30mm F4 Finder Scope 2 x Screws