SVBONY SV48P Refracting Astronomical Telescope Tube 1.252 Inch Universal 90500 Dual Speed Focusing 1. Excellent optical performance and high quality mechanical components 2. Equipped with achromatic glass for good edge-to-edge viewing, and full multi-green coated lenses to maximize light transmission and eliminate false colors 3. 2 inch rotatable dual-speed focuser for smooth operation, excellent feel and precise adjustability 4. Optical design: refractor 5. Optical coating: FMC 6. Objective lens: double composite air spaced achromatic design 7. Focal length: 500mm 8. Focal length ratio: F5.5 9. Eyepiece barrel diameter: 2 inch (with 1.25 inch adapter) 10. Focuser: 2 inch RAP dual-speed focuser 11. Mounting type: dovetail plate 12. Caliber diameter: about 9cm 13. Dovetail length: about 130cm 14. Net weight: about 2730g General notes: 1. Avoid exposing the telescope to rapid temperature changes as this may cause fogging due to condensation of water vapor on the objective lens. If this happens, place the objective lens close to, but not too close to, a heat source and wait for the moisture to evaporate 2. Never look directly into the sun with your naked eye or binoculars (unless you have a suitable solar filter) 3. Adult supervision is recommended when used by children under 10 years old Packing list: - Binoculars x 1 - 2-1.25 inch adapter x 1 - Stand x 1 - Lens cap x 1 - 1.25 inch dust cover x 1 - 130mm dovetail mounting plate with tube ring x 1