Explore Scientific 16in/406mm Truss Tube Dobsonian Telescope

406.4mm (16-inch) Dia. 46.4mm Thick (1:8.8 Ratio) f/4.5 Parabolic Primary Mirror Newtonian with Fused Quartz Glass; Advanced 3-Point Spring-Loaded Primary Mirror Collimatable Cell (Adjusts from the Front with hex Collimation Assist Tool for One-Person Collimation) in Metal Mirror Box with Metal Protective Lid while Unassembled and Storing. Twin Fans Draw Air Across the Primary Mirror for Bringing to Ambiant Temperature with AA Battery Pack (Batteries Not Included). Mirror Box with Folding Built-In Handle Rests on the Metal Dobsonian Box with 3-Point 8-inch Radius Azimuth Bearing Riding on Large Teflon Disks.Two 16.5-inch Altitude Bearings attach to Mirror Box with No-Tool Knobs and Ride on Teflon Pads in the Dobsonian Box with Tension Clutch; 88mm M.A. Secondary Mirror Mounted in Metal Secondary Cage with Advanced Spring-Loaded No-Tool Knob Collimation Adjustments; 4 Sets of Dual Metal Truss Tubes with No-Tool Attachment Bolts; Aluminum Coatings with Quartz Overcoat; Black Finish; Dual-Speed 2-inch R&P Focuser with Extension Tube, Compression Ring, and 1.25-inch Adapter; Adjustable Red-Dot Finder; Flexible Lightweight Light Baffle Specifications for Explore Scientific 16in/406mm Truss Tube Dobsonian Telescope: Manufacturer: Explore Scientific Color: Black Package Contents: Explore Scientific 16in/406mm Truss Tube Dobsonian Telescope