Apochromatic Refractors

110mm Aperture 766mm Focal Length (f/7) 4-Element Apochromatic Optics Integrated Field Flattener 3-inch Dual-Speed Focuser 14.9 lb. Weight with Ha...

70mm Aperture 490mm Focal Length (f/7) 4-Element Quadruplet Optical Design Integrated Field Flattener 2.4" Dual-Speed Rack & Pinion Focuser 6....

Patented William Optics Internal Focus Design (WIFD) Rigid M92 Rear Thread with M63 Adapter Included Vixen/Arca-Swiss Dual-Sided Mounting Plate In...

Aperture: 85mm Focal Length: 600mm Focal Ratio: f/7 Optical Design: Apochromatic (APO) Doublet Focuser: 2-inch, 10:1 Dual-Speed Rack-and-Pinion We...

100mm Aperture Apochromatic Doublet Refractor FPL-53 Extra-Low Dispersion Glass 700mm Focal Length at f/7 Lightweight 8.4-pound Optical Tube Assem...

56mm Aperture, 269mm Focal Length (f/4.8) 5-Element Advanced Petzval Optical Design 50mm Image Circle for Full-Frame Sensors William Optics Intern...

560mm Focal Length f/7 Focal Ratio Triplet Objective with ED Glass APS-C Corrected Image Circle 55mm Back Focus 0.42kg Weight Description FAQ S...

72mm Aperture Quintuplet APO Optics 400mm Focal Length at f/5.6 Covers a 44mm Full-Frame Image Circle Integrated 17-Blade Aperture (f/5.6-f/22) 2....

70mm Aperture 336mm Focal Length f/4.8 Focal Ratio Quintuplet (5-Element) APO Petzval Optical Design 44mm Full-Frame Image Circle Contains Two ED ...

91mm Aperture, 448mm Focal Length (f/4.9) 5-Element Advanced Petzval Optical Design 55mm Corrected Image Circle WIFD Rack & Pinion Internal Fo...

68mm Aperture 7-Element Astrograph Fast f/3.8 Focal Ratio 260mm Focal Length 48mm Full-Frame Image Circle Weighs only 2.98 kg (6.57 lbs) WIFD Focu...

185mm Aperture Triplet APO Objective 1295mm Focal Length at f/7 Includes one ED Glass Element for Color Correction 95mm Retractable Rear Tube for ...

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...

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...

80mm Aperture 500mm Focal Length (f/6.25) Apochromatic ED Glass Optics 2" Rack & Pinion Hybrid Drive Focuser Includes 90mm White Light Solar F...

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

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...

Complete astrophotography bundle with 80mm triplet refractor and GoTo mount 80mm aperture and 480mm focal length for wide-field imaging HOYA FCD10...

80mm Air-Spaced Triplet Apochromatic OTA Includes a matched 0.8x Focal Reducer iEXOS-100 Equatorial Mount with GoTo PMC-Eight wireless control sys...

Features premium HOYA FCD100 ED glass for superior color correction Air-spaced triplet optical design delivers high-contrast, sharp images Lightwe...

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

Features genuine HOYA FCD100 ED glass for superior color correction Air-spaced triplet optical design virtually eliminates chromatic aberration Li...