Apochromatic Refractors

Aperture: 60mm Focal Length: 360mm Focal Ratio: f/6 Optical Design: APO Doublet (2 elements / 1 group) Focuser: 1.25" Helical Weight: 3 lbs (OTA) ...

100mm Super-Apochromatic Triplet Optics 550mm Focal Length at f/5.5 3.4" Dual-Speed (11:1) Rack & Pinion Focuser 16 lb Optical Tube Weight Inc...

70mm Super-Apochromatic ED Triplet Optics 490mm Focal Length at f/7 2.7" Dual-Speed (11:1) Rack & Pinion Focuser 7-pound Optical Tube Assembly...

80mm Apochromatic Doublet 600mm Focal Length (f/7.5) FPL-53 Extra-Low Dispersion Glass 2.8" Dual-Speed (11:1) Crayford Focuser 7.3 pound Optical T...

76 mm Aperture, 365 mm Focal Length (f/4.8) 5-Element Advanced Petzval Optical Design 50 mm Corrected Image Circle William Optics Internal Focusin...

120mm Aperture Triplet Air-Spaced APO Objective Includes one ED Glass Element for Superb Color Correction 840mm Focal Length at a Native f/7 Focal...

160mm Aperture Triplet Air-Spaced APO Objective 1120mm Focal Length at f/7 Includes One ED Glass Element for Color Correction Retractable Dew Shie...

1.Rugged housing prevents damage; 2.Sliding graceful and soft dual-speed focuser; 3.Ed glass (S-FPL51) can produce very beautiful and clear images...

181mm Aperture, 998mm Focal Length Fast f/5.5 Focal Ratio 7-Element Optical Design with 3 Super ED Glass Elements 55mm Corrected Image Circle 4.1-...

111mm Aperture 7-Element Astrograph 528mm Focal Length at a fast f/4.8 45mm Image Circle for Full-Frame Sensors William Optics Internal Focus Desi...

50mm Aperture Triplet APO Objective 275mm Focal Length f/5.5 Focal Ratio Includes Two ED Glass Elements 1.07kg Total Weight 196mm Retracted Length...

60mm Aperture Triplet Air-Spaced APO Objective 360mm Focal Length f/6 Native Focal Ratio Modular design supports optional 80mm objective lens Stan...

81mm Aperture Triplet Apochromatic Refractor FPL-53 Ohara Glass for Superior Color Correction William Optics Internal Focusing Design (WIFD) Inclu...

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...

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...