Features 1、60mm object lens with fully multi-coated. 2、6-point screw bracket. 3、240mm focal length. 4、Quick focus retractable(35mm) tube. 5、10mm focusing range with -focusing helical focuser. 6、1.25/"/31.7mm connector, can be connected to eyepiece, electronic equipment, etc. 7、Removable dovetail bracket. Specification Features: 60mm object lens with fully multi-coated. 6-point screw bracket. 240mm focal length. Quick focus retractable(35mm) tube. 10mm focusing range with micro-focusing helical focuser. 1.25"/31.7mm connector, can be connected to eyepiece, electronic equipment, etc. M42*0.75 external screw thread to connect with camera. Removable dovetail bracket. For use with astrophotography telescopes. Compatible with popular CCD guide star, SG4, QHY5II, ZWO etc. Specifications: Material: Metal Focal Length: 240mm Focal Ratio: F4 Item Weight: 889g / 31.36oz Package Weight: 1074g / 37.91oz Package Size: 28 * 15 * 15cm / 11.02 * 5.91 * 5.91in Package List: 1 * Lens Cone 1 * Guide Ring Package List 1 * Lens Cone 1 * Guide Ring