Optical Tubes Only (OTA)

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...

130mm Aperture Quadruplet APO Optics 1000mm Focal Length at f/7.7 Built-in Field Flattener 60mm Corrected Image Circle Total Assembled Weight of 1...

130mm Hyperbolic Newtonian Optics 364mm Focal Length f/2.8 Focal Ratio 44mm Full-Frame Image Circle Total Assembled Weight: 4.8kg Description F...

260mm (10.2") Aperture Aspherical Primary Mirror 1300mm Focal Length at a fast f/5 Focal Ratio Massive 80mm Corrected Image Circle for Large Forma...

132mm Aperture, 910mm Focal Length (f/6.9) Air-Spaced Triplet Apochromatic Objective Premium FPL-53 Glass for Superior Color Correction Heavy-Duty...

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 ...

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

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...

127mm Achromatic Doublet Refractor Air-Spaced Crown-and-Flint Optics Dual-Speed Focuser for Fine Adjustment Dielectric-Coated Diagonal Included Cr...

151mm Maksutov-Cassegrain Optical Design 1800mm Focal Length f/12 Focal Ratio 94% Reflectivity Radiant Aluminum Quartz (RAQ)™ Coatings 31% Seconda...

127mm Maksutov-Cassegrain Optical Design 1540mm Focal Length f/12.1 Focal Ratio Radiant™ Aluminum Quartz™ (RAQ™) coatings with 94% reflectivity We...

102mm Maksutov-Cassegrain Optical Tube 1300mm Focal Length f/12.7 Focal Ratio 94% Reflectivity RAQ™ Mirror Coatings Weighs Only 4.6 lbs Descrip...

203mm (8-inch) Newtonian Reflector Astrograph Fast f/4 Focal Ratio for Short Exposures 800mm Focal Length 94% Reflectivity Radiant™ Aluminum Quart...

203mm (8") Rowe-Ackermann Schmidt Astrograph Incredibly fast 400mm f/2.0 optical system 22mm optimized image circle for sharp stars edge-to-edge U...

500mm (20") primary mirror for exceptional light-gathering Fast f/4 focal ratio, ideal for deep-sky imaging Standard 1/6 PV wavefront optics, hand...

400mm (16") primary mirror diameter 1600mm focal length at a fast f/4 focal ratio Standard 1/6 PV wavefront optics, Zygo-certified 9-point CNC-mac...

350mm (14") primary mirror diameter 1600mm nominal focal length Fast f/4.6 focal ratio Standard 1/6 PV wavefront optical accuracy, certified by Zy...

300mm (12") Primary Mirror 1600mm Focal Length f/5.3 Focal Ratio Standard 1/6 PV Wavefront Hand-Figured Optics CNC-Machined 9-Point Mirror Cell wi...

300mm (12") primary mirror diameter 1200mm nominal focal length Fast f/4 focal ratio Standard 1/6 PV wavefront optical grade Lightweight 14kg alum...

250mm (10-inch) primary mirror for exceptional light-gathering 1600mm focal length at f/6.3, ideal for both planetary and deep-sky observation Sta...

250mm (10") Primary Mirror Diameter 1200mm Nominal Focal Length f/4.8 Focal Ratio Standard 1/6 PV Wavefront Optics 11kg Nominal Tube Weight CNC 9-...

200mm Primary Mirror Diameter 1200mm Focal Length (f/6) Standard 1/6 PV Wavefront Optics 8kg Nominal Tube Weight CNC 9-Point Mirror Cell with Cool...

200mm (8-inch) Primary Mirror 900mm Focal Length Fast f/4.5 Focal Ratio Standard 1/6 PV Wavefront Hand-Figured Optics Lightweight 7kg Aluminium Tu...

150mm Primary Mirror 1200mm Focal Length f/8 Focal Ratio 1/6 PV Wavefront Standard Optical Grade Lightweight 5kg Aluminum Tube Description FAQ ...