Optical Tubes Only (OTA)

100mm Aperture f/5.5 Focal Ratio / 550mm Focal Length Sextuplet Air-Spaced APO Optical Design 36mm Corrected Image Circle 4.3kg Net Weight Desc...

SHARPSTAR's newly developed ultra-short focal ratio paraboloid Newtonian reflector 20032PNT was launched, which filled a domestic gap in this fie...

140mm Aperture 910mm Focal Length f/6.5 Focal Ratio Triplet Air-Spaced APO Objective with Two ED Elements 0.83 arc-seconds Resolution 10.1kg Net W...

This product is a new generation of independent design of quintuple air-spaced high quality refractor telescope which take the form of dual after...

Compare with the first generation products, it has the following features: 1 The optical design has changed, in addition to the original F5.8 foc...

Aperture: 94mm Focal Ratio: f/5.5 Focal Length: 517mm Optical Design: Triplet APO with Two ED Elements Weight: 3.3KG Description FAQ Specificat...

156mm Aperture Triplet Apochromat 1217mm Focal Length (f/7.8) FPL-53 & Lanthanum Glass Elements 3.7" Rack & Pinion Focuser Thermally Stabl...

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...

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 ...

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...

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

190mm Maksutov-Newtonian Optical Design 1000mm Focal Length Fast f/5.3 Focal Ratio Radiant Aluminum Quartz (RAQ)™ coatings with 94% reflectivity 2...

182mm (7.1-inch) Maksutov-Cassegrain Optical Tube 2700mm Focal Length at f/15 5% Secondary Obstruction by Area for High Contrast Radiant™ Aluminum...

305mm (12") Newtonian Reflector Astrograph 1200mm Focal Length Fast f/4 Focal Ratio 94% Reflectivity Radiant™ Aluminum Quartz (RAQ™) Coatings 57 l...

254mm (10-inch) Newtonian Reflector Astrograph 1000mm Focal Length Fast f/4 Focal Ratio 94% Reflectivity Radiant™ Aluminum Quartz (RAQ) Coatings 2...

279mm (11") Rowe-Ackermann Schmidt Astrograph Extremely fast f/2.2 focal ratio for short exposures 620mm focal length ideal for wide-field deep-sk...

203.2mm (8") Schmidt-Cassegrain Optical Tube Assembly 2032mm Focal Length at a f/10 Focal Ratio StarBright XLT Optical Coatings for Maximum Transm...

150mm (6") Schmidt-Cassegrain Optical Tube Assembly 1500mm Focal Length (f/10) StarBright XLT Optical Coatings Weighs Only 10 lbs (4.54 kg) CG-5 D...

355.5mm (14") Schmidt-Cassegrain Optical Tube Assembly 3910mm Focal Length at f/11 Dawes Limit Resolution of 0.33 Arc Seconds 2581x Light Gatherin...

279.4mm (11") Schmidt-Cassegrain Optical Tube Assembly 2800mm Focal Length at an f/10 Focal Ratio Resolving power of 0.42 arc seconds (Dawes Limit...

355.6mm (14") Rowe-Ackermann Schmidt Astrograph Ultra-fast f/2.2 focal ratio with 790mm focal length Covers a 60.1mm image circle, with a usable f...