Compatibility; compatible with PL SPL eyepiece with 1.25 inch; compatible with ZWO QHY SV305pro guide camera; compatible with camera with additional T-ringGuiding bezel 60 mm; 60mm wide aperture allows many potential guide stars to be seen; fully multi-layered green coating and internal mat design make the image crispPrecision scope finder; 35mm rear focus length and 0.05mm scale twin helix fine focus with 8mm focus length for stiff performance without bendingGuide scope ring kit; 2 M6 holes; 1 1/4 "-20 UNC hole; 2 M8 holes; 89 m long dovetail plate; 70 mm inner diameter for telescope 43 to 70 mm outer diameterDurable and stable; all-metal material; clamping ring with 2 knurled screws and stable, scratch-resistant brass ring Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.