Suitable for OTA with focal length within 700mm; SV165 compact mini guide scope can be used with astronomical telescopes with focal length within 700mm Clear and sharp vision; fully multi-coated and achromatic optical glass brings you clearer and sharper vision in astronomical observation and astrophotography Compatible with guide cameras; the 1.25-inch and M42 threaded interface is compatible with SV305 Pro and Orion ZWO QHY and so on auto guiding cameras; guidescope with two T2 extension tubes can assist focusing Front focuser with scale; it is convenient to mark the focus position to improve the efficiency of Repeating focusing; Locking ring can ensure that the focus position does not change during use. Six-point guide ring; the angle-adjustable six-point fixation method can adjust the coaxiality of the guide scope and the main telescope according to the needs Supports focusing with diagonal; SV165 mini guide scope can be used with diagonal mirrors and eyepieces to focus for astronomical observation and star finding Standard dovetail base; the bottom is equipped with standard UNC1/4-20 camera stand mounting holes; providing more general and convenient installation methods Aluminum alloy CNC processing; lens barrel adopts aluminum alloy CNC processing to improve quality and precision to ensure that the guide scope is more durable. 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. Strong Adaptability The SV211 CNC handle bar adopts M6 mounting screw holes, and the interface type is unified, making it highly adaptable.