Explore Scientific ED80 Classic White Air Spaced Triplet480mm Focal Length2.5in HEX Focuser. f/6 True APO with HOYA FCD100 ED Glass in Advanced 4-Point Push-Pull Collimatable Cell with Centering Adjustments and Locks; Metal Tube; EMD Coatings; Retractable Lens Hood; Classic White Finish; Rotatable HEX Dual-Speed 2.5-inch R&P Focuser with 2 Extension Tubes and Compression Ring; 45mm Wide Saddle Dove Plate (Vixen-Style) also Threaded to Mount on Camera Tripod; 2-inch 99percent Reflective Diagonal Mirror with Compression Ring and 1.25-inch Adapter Specifications for Explore Scientific ED80 Classic White Air Spaced Triplet 480mm Focal Length: Manufacturer: Explore Scientific Focal Length: 480 mm Focal Ratio: f/6 Additional Features: Dovetail - Vixen Package Contents: Explore Scientific ED80 Classic White Air Spaced Triplet 480mm Focal Length Explore Scientific FCD100-0806-02: ED80 Classic White Air Spaced Triplet480mm Focal Length2.5in HEX Focuser