Astrographs

91mm Aperture Quadruplet APO Optics 609mm Focal Length at f/6.7 44mm Full-Frame Corrected Image Circle Integrated Field Flattener Design 3.92kg Ne...

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...

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

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...

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...

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 f/2.0 optical system with 400mm focal length Advanced VX computerized German equatori...

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...

Optimized Dall-Kirkham (ODK) Optical Design Corrected, Coma-Free Flat Field for Imaging Open Truss Tube for Thermal Stability and Rigidity Hand-Fi...

500mm truss-tube Dall-Kirkham f/6.8 carbon-fibre-sandwich optics Open truss for shorter packed length Built to order in the UK Description Spec...

Optimized Dall-Kirkham (ODK) Optical Design Open Truss Tube Framework Primary and Secondary Mirrors by Orion Optics UK Engineered for Astrophotogr...

400mm (16") Optimized Dall-Kirkham Optics 2720mm Focal Length (f/6.8) >52mm Fully Corrected and Illuminated Image Circle 2.4µm On-Axis Spot Siz...

350mm (14") Optimized Dall-Kirkham Optics 2380mm Focal Length (f/6.8) >52mm Fully Illuminated and Corrected Image Circle 2.1µm On-Axis Spot Siz...

300mm (12") Optimized Dall-Kirkham Astrograph 2040mm Focal Length (f/6.8) >52mm Flat, Corrected Image Circle 1.8µm On-Axis Spot Size Carbon Fib...

250mm (10-inch) Optimized Dall-Kirkham optics 1700mm focal length at a native f/6.8 focal ratio 50mm fully corrected, flat image circle for large ...