Optical Tubes Only (OTA)

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 ...

400mm (16") Primary Mirror Diameter 2720mm Focal Length at f/6.8 Corrected Dall-Kirkham Optical Design >52mm Flat Field Image Circle Carbon Fib...

Primary Mirror Diameter: 350mm Focal Ratio: f/6.8 Corrected Image Circle: >52mm Tube Material: Carbon Fibre Sandwich Back Focus: 210mm Tu...

300mm (12") Optimised Dall-Kirkham Optics 2040mm Focal Length at a fast f/6.8 Focal Ratio Covers a greater than 52mm flat imaging circle Delivers ...

250mm (10") Corrected Dall-Kirkham Optics 1700mm Focal Length at f/6.8 50mm Fully Corrected Flat Image Circle 3.5μm On-Axis Spot Size Carbon Fibre...

Largest model in the AG Astrograph range Carbon-fibre-sandwich tube CERES 3" (76.2mm) focuser standard Built to order in the UK Description Spe...

400mm (16") Primary Mirror Diameter 1520mm Focal Length at a fast f/3.8 Focal Ratio Corrected Flat Field Size >50mm Carbon Fibre Sandwich Tube ...

350mm Primary Mirror Diameter 1330mm Focal Length (f/3.8) >50mm Corrected Flat Field Carbon Fibre Sandwich Tube Construction 3.4µm On-Axis Spot...

300mm (12") Primary Mirror 1140mm Focal Length Fast f/3.8 Focal Ratio Carbon Fibre Sandwich Tube Construction >50mm Corrected Flat Field 3" Cer...

250mm (10-inch) Primary Mirror 950mm Focal Length Extremely Fast f/3.8 Focal Ratio 50mm Fully Corrected Flat Image Field Carbon Fibre Sandwich Tub...

200mm (8-inch) Primary Mirror 760mm Focal Length Extremely Fast f/3.8 Focal Ratio 45mm Corrected Flat Field Circle Carbon Fibre Sandwich Tube Cons...

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 f/6 Focal Ratio 480mm Focal Length Achromatic Refractor Design Rack & Pinion Focuser Description FAQ Specifications In the Bo...

250mm (10-inch) Ritchey-Chrétien Optical Design 2000mm Focal Length at f/8 0.46 arc second Resolving Power 3-inch Dual Speed Focuser 35 lb Steel T...

150mm Rumak-style Maksutov-Cassegrain Optics 1800mm Focal Length f/12 Focal Ratio 0.77 Arc Second Resolving Power 13.4 lbs Tube Weight Dual-Speed ...

80mm Achromatic Refractor Professional-Grade Solarlite Solar Filter Included 25mm Plössl Eyepiece and 90° Diagonal Smartphone and DSLR Camera Adap...

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...

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

80mm Aperture Apochromatic Triplet Refractor 480mm Focal Length Fast f/6 Focal Ratio FPL51 ED Glass Element for Color Correction Resolving Power o...