Optical Tubes Only (OTA)

152mm (6-inch) Aperture f/6.5 Focal Ratio Air-Spaced Doublet Achromatic Optics 2" Dual-Speed Focuser 2" Diagonal with 99% Dielectric Coatings 8x50...

102mm Aperture 714mm Focal Length (f/7) Air-Spaced Triplet Apochromatic Design Genuine HOYA FCD100 ED Glass Element 2.5" HEX Focuser with 10 lb Ca...

102mm Aperture Air-Spaced Triplet Apochromatic Optics Premium HOYA FCD100 ED Glass Carbon Fiber Optical Tube Assembly 2.5" Hexagonal Rack & Pi...

152mm (6") Aperture f/8 Focal Ratio Air-Spaced Triplet Apochromatic Optics HOYA FCD1 Extra-Low Dispersion Glass Carbon Fiber Optical Tube 20.5 lbs...

80mm Aperture Air-Spaced Apochromatic Triplet Optics Features HOYA FCD1 Extra-Low Dispersion Glass Includes Field Flattener for f/5 to f/7 Telesco...

80mm Aperture 480mm Focal Length (f/6) HOYA FCD100 ED Air-Spaced Triplet Optics Includes 0.8x Focal Reducer/Corrector 2.5" Hexagonal Focuser De...

80mm Aperture Triplet Apochromatic Refractor Features Hoya FCD100 ED Glass Element Air-Spaced Triplet Objective Lens Includes Field Flattener for ...

Apochromatic Triplet Refractor Genuine HOYA FCD100 ED Glass Air-Spaced Optical Design Proprietary EMD Multi-Layer Coatings Heavy-Duty Hexagonal Fo...

80mm Achromatic Refractor Professional-Grade Solarlite Solar Filter Included 25mm Plössl Eyepiece and 90° Diagonal Smartphone and DSLR Camera Adap...

127mm (5") Aperture f/7.5 Focal Ratio Air-Spaced Triplet Apochromatic Optics HOYA FCD100 ED Glass Element 2.5" Hexagonal Rack-and-Pinion Focuser ...

127mm Aperture f/7.5 Focal Ratio / 952mm Focal Length Air-Spaced Triplet Apochromat with FCD100 Glass Carbon Fiber Optical Tube 2.5" HEX Focuser ...

127mm (5") Maksutov-Cassegrain Optical Tube 1900mm Focal Length f/15 Focal Ratio Includes 25mm Plössl Eyepiece & 1.25" Diagonal Smartphone Ada...

150mm (6") Newtonian Reflector 600mm Focal Length Fast f/4 Focal Ratio 10:1 Dual-Speed Crayford Focuser OTA Weight: 9 lbs. 10 oz. Description F...

200mm (8") Newtonian Reflector 800mm Focal Length Fast f/4 Focal Ratio 10:1 Dual-Speed Crayford Focuser OTA Weight: 20 lbs 6 oz Description FAQ...

250mm (10") Parabolic Primary Mirror 1000mm Focal Length Fast f/4 Focal Ratio 10:1 Dual-Speed Focuser 34 lb 1 oz Optical Tube Assembly Weight D...

Clear Aperture: 300mm (11.8") Focal Ratio: f/4 Focal Length: 1200mm OTA Weight: 48 lbs Focuser: 10:1 dual-speed Description FAQ Specificat...

80mm Achromatic Refractor Optics 400mm Focal Length (f/5) Lightweight 2.2 lbs Optical Tube Includes 25mm and 9mm 1.25" Eyepieces 45º Erect Image D...

150mm Rumak-style Maksutov-Cassegrain Optics 1800mm Focal Length f/12 Focal Ratio 0.77 Arc Second Resolving Power 13.4 lbs Tube Weight Dual-Speed ...

10" (254mm) Ritchey-Chretien Optical Design 2032mm Focal Length f/8 Focal Ratio Carbon Fiber Truss Tube for Thermal Stability 3-inch, 10:1 Dual-Sp...

12" (304mm) Ritchey-Chretien Optics 2432mm Focal Length f/8 Focal Ratio Carbon Fiber Truss Tube Design 3" Dual-Speed 10:1 Crayford Focuser 53 lb O...

14" (355mm) Ritchey-Chretien Optical Design 2848mm Focal Length at f/8 Carbon Fiber Truss Tube for Thermal Stability Heavy-duty 3" Dual-Speed 10:1...

16" (406mm) Aperture 3248mm Focal Length f/8 Focal Ratio Ritchey-Chretien Optical Design Carbon Fiber Truss Tube 3" 10:1 Dual-Speed Focuser Des...

150mm (6") Ritchey-Chretien Optical Design 1370mm Focal Length f/9 Focal Ratio 10:1 Dual-Speed 2" Crayford Focuser 12 lbs Tube Weight Descripti...

200mm (8") Ritchey-Chretien Optical Design 1624mm Focal Length at f/8 Coma-Free Optics for Flat-Field Astrophotography 2" 10:1 Dual-Speed Crayford...