Optical Tube Assemblies(OTA's)

Sky-Watcher Evostar 150DX Doublet apochromatic optical design Two-element, air-spaced optical assembly minimizes false color 150mm aperture, 1200mm focal length, f/8 focal ratio 3.4" Helinear rack & pinion focuser Aluminum tube coated with glossy,...

Sky-Watcher Evostar 150ED 150 mm apochromatic refractor with matched lens assembly with one ED element 1200 mm focal length (f/8) Dual-speed 2” Crayford-type focuser Tube-ring attachment hardware with V-style dovetail plate Aluminum case M48...

Sky-Watcher Evostar 120 APO Doublet apochromatic optical design Two-element, air-spaced optical assembly minimizes false color 120mm aperture, 900mm focal length, f/7.5 focal ratio 2-inch dual-speed Crayford-style focuser Aluminum tube coated with...

Sky-Watcher Evostar 100 APO 100 mm apochromatic Refractor with Schott BK-7 and FPL-53 ED glass 900 mm focal length (f/9) Dual-speed 2″ Crayford-type focuser with 1.25″ adaptor 8×50 RA erect-image finderscope 2″ dielectric...

Sky-Watcher Evostar 80 APO 80 mm apochromatic Refractor with Schott BK-7 and FPL-53 ED glass 600 mm focal length (f/7.5) Dual-speed 2″ Crayford-type focuser with 1.25″ adaptor 8×50 RA erect-image finderscope 2″ dielectric...

Sky-Watcher Evostar 72 APO 72 mm apochromatic refractor with matched lens assembly with one ED element 420 mm focal length (f/5.8) Dual-speed 2” Crayford-type focuser Tube-ring attachment hardware with V-style dovetail plate Aluminum case Specs ...

Sky-Watcher Evoguide 50 APO 50mm f/4.8 Apochromatic Doublet refractor  242mm focal length  1.25” helical focuser Uses expertly matched ED glass to deliver dramatic, coal-black skies and faithful, contrast-rich views Prime focus...

Sky-Watcher Esprit 100 ED APO refractor Included: Helinear Track focusing system with zero image shift. 8 x 50 right angle finderscope 2-inch Star diagonal 2-element field flattener Camera adapter D-style dovetail Padded case Specs SKU:...

Celestron EdgeHD 925 OTA - CGE

Celestron C11 SCT OTA - CGE The Schmidt Cassegrain Telescope(SCT) is a hybrid optical design termed catadioptric. The modern SCT is a popular telescope design due to it's compact size vs aperture. StarBright XLT coated optics housed in a lightweight...

Celestron C925 SCT OTA - CGE The Schmidt Cassegrain Telescope(SCT) is a hybrid optical design termed catadioptric. The modern SCT is a popular telescope design due to it's compact size vs aperture. StarBright XLT coated optics housed in a lightweight...

Celestron C8 SCT OTA - CGE The Schmidt Cassegrain Telescope(SCT) is a hybrid optical design termed catadioptric. The modern SCT is a popular telescope design due to it's compact size vs aperture. StarBright XLT coated optics housed in a lightweight...

Celestron C6 SCT OTA - CG5 The Schmidt Cassegrain Telescope(SCT) is a hybrid optical design termed catadioptric. The modern SCT is a popular telescope design due to it's compact size vs aperture. StarBright XLT coated optics housed in a lightweight...

Celestron 8in Rowe-Ackermann Schmidt Astrograph OTA 8in Rowe-Ackermann Schmidt Astrograph (RASA 8) Flat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor. Unlike the larger...