This versatile 50mm aperture guide scope with a built-in helical focuser for precise focusing of potential guide stars.Designed for use with the guider CCD astronomy camera or eyepiece. It is an ideal accessories to any astrophotographers. Extinction design of telescope. Taper matt tooth and spray matting paint design can greatly reduce the light loss of light in the entire lens barrel, making the image clearer and sharper; Unique design with double protection to avoid loss of light, making the images you observe clearer and sharper. Lightweight and portable. 604g and 240mm total length that is very small and compact autoguiding system adds hardly any weight to an astrophotography setup. Is it inconvenient to carry OTA? Have a little trouble going out? SV211 handle bar is the solution to travel problems. It is suitable for close handling and protects OTA from damage. At the same time, it can also be used as a general dovetail, suitable for installing all SVBONY guide scopes and finder scopes, especially designed for SV198 guide scopes, which are perfectly matched and enriched in use. The SV211 CNC handle bar adopts M6 mounting screw holes, and the interface type is unified, making it highly adaptable. The SV211 handle bar can improve the safety factor of procuct installation process. SV211 dovetail base can reduce collision and wear when taking the telescope somewhere.