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The optical tube is really the heart of your night time exploration. Sizes range from 50mm to 20" in diameter as well as f/ratios from f/2.2 to f/15. The optical designs range from simple doublet refractors to complex cassegrains with built-in field flatteners. There is literally something for everyone here, you just have to decide what path you want to walk down. We are always here to help with any questions you have.
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Original price $0.00 - Original price $0.00Original price $0.00$1,399.00$1,399.00 - $1,399.00Current price $1,399.00Astro-Tech AT115EDT f/7 ED Triplet Refractor OTA
Astro-TechIn StockThe Astro-Tech AT115EDT 4.53" f/7 ED triplet apochromatic refractor offers more performance and features than similarly-priced smaller aperture com...
View full detailsOriginal price $0.00 - Original price $0.00Original price $0.00$1,399.00$1,399.00 - $1,399.00Current price $1,399.00 -
Original price $1,899.00 - Original price $1,899.00Original price$1,899.00$1,899.00 - $1,899.00Current price $1,899.00Astro-Tech AT130 EDT f/7 ED Triplet OTA
Astro-TechIn StockSome observers feel that the Astro-Tech AT130EDT 5.12" f/7 ED triplet apochromatic refractor compares favorably in performance to scopes nearly fou...
View full detailsOriginal price $1,899.00 - Original price $1,899.00Original price$1,899.00$1,899.00 - $1,899.00Current price $1,899.00 -
Original price $1,849.00 - Original price $1,849.00Original price$1,849.00$1,849.00 - $1,849.00Current price $1,849.00Astro-Tech AT125EDL Refractor OTA FCD-100 and Lanthanum f/7.8 Doublet
Astro-TechIn StockThe Astro-Tech AT125EDL takes the performance of the it smaller siblings and combines it with the mechanics of the EDT line. This Astro-Tech ED ref...
View full detailsOriginal price $1,849.00 - Original price $1,849.00Original price$1,849.00$1,849.00 - $1,849.00Current price $1,849.00 -
Original price $979.99 - Original price $979.99Original price$979.99$979.99 - $979.99Current price $979.99Explore Scientific AR152 6" f/6.5 Achromatic Doublet Refractor Optical Tube
Explore ScientificMore on the wayThis 6" Explore Scientific AR152 achromatic refractor optical tube is a sensational value - a big 6" (152mm) and fast f/6.5 refractor that's priced...
View full detailsOriginal price $979.99 - Original price $979.99Original price$979.99$979.99 - $979.99Current price $979.99 -
Original price $2,999.99 - Original price $2,999.99Original price$2,999.99$2,999.99 - $2,999.99Current price $2,999.99Explore Scientific 127mm f/7.5 Carbon Fiber FCD100 ED Triplet Refractor
Explore ScientificIn StockThis big 127mm (5") Explore Scientific Carbon Fiber air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at a su...
View full detailsOriginal price $2,999.99 - Original price $2,999.99Original price$2,999.99$2,999.99 - $2,999.99Current price $2,999.99 -
Original price $2,995.00 - Original price $2,995.00Original price$2,995.00$2,995.00 - $2,995.00Current price $2,995.00Astro-Tech AT150EDL Refractor OTA FCD-100 and Lanthanum f/8 Doublet with Hard Case
Astro-TechIn StockThe Astro-Tech AT150EDL takes the performance of the it smaller siblings and combines it with the mechanics of the EDT line. This Astro-Tech ED ref...
View full detailsOriginal price $2,995.00 - Original price $2,995.00Original price$2,995.00$2,995.00 - $2,995.00Current price $2,995.00 -
Original price $999.00 - Original price $999.00Original price$999.00$999.00 - $999.00Current price $999.00Celestron 6" f/8 Achromatic Doublet Refractor Optical Tube, CG5/AVX Dovetail
CelestronMore on the wayHere's a sensational value - a big 6" (150mm) achromatic refractor optical tube that's priced like other manufacturers' 80mm scopes. This Celestro...
View full detailsOriginal price $999.00 - Original price $999.00Original price$999.00$999.00 - $999.00Current price $999.00 -
Original price $2,499.00 - Original price $2,499.00Original price$2,499.00$2,499.00 - $2,499.00Current price $2,499.00Explore Scientific 127mm f/7.5 Classic White FCD100 ED Triplet Refractor
Explore ScientificIn StockThis big 127mm (5") Explore Scientific Essential Series air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at ...
View full detailsOriginal price $2,499.00 - Original price $2,499.00Original price$2,499.00$2,499.00 - $2,499.00Current price $2,499.00 -
Original price $4,165.00 - Original price $4,165.00Original price$4,165.00$4,165.00 - $4,165.00Current price $4,165.00Sky-Watcher Esprit 120mm f/7 ED Apochromatic Triplet Refractor With Field Flattener S11420
Sky-WatcherIn StockThe big Sky-Watcher Esprit 120mm ED apochromatic triplet refractor with thread-on field flattener combines premium high contrast/high resolution im...
View full detailsOriginal price $4,165.00 - Original price $4,165.00Original price$4,165.00$4,165.00 - $4,165.00Current price $4,165.00 -
Original price $2,490.00 - Original price $2,490.00Original price$2,490.00$2,490.00 - $2,490.00Current price $2,490.00Sky-Watcher Evostar 120mm f/7.5 ED Doublet Apochromatic Refractor S11130
Sky-WatcherIn StockThis 120mm Sky-Watcher Evostar 120ED is a premium doublet apochromatic refractor with highly-reviewed high contrast/high resolution optics that Sky...
View full detailsOriginal price $2,490.00 - Original price $2,490.00Original price$2,490.00$2,490.00 - $2,490.00Current price $2,490.00 -
Original price $3,195.00 - Original price $3,195.00Original price$3,195.00$3,195.00 - $3,195.00Current price $3,195.00Astro-Tech AT130EDX f/7 FCD100 ED Triplet APO
Astro-TechIn StockThe AT130EDX is the next evolution of instruments from Astro-Tech. The instrument quality is what you come to expect from an Astro-Tech with an eye...
View full detailsOriginal price $3,195.00 - Original price $3,195.00Original price$3,195.00$3,195.00 - $3,195.00Current price $3,195.00 -
Original price $1,255.00 - Original price $1,255.00Original price$1,255.00$1,255.00 - $1,255.00Current price $1,255.00Sky-Watcher Evostar 100ED 100mm f/9 ED Doublet Apochromatic Refractor S11120
Sky-WatcherIn StockThis 100mm Sky-Watcher Evostar 100ED doublet apochromatic refractor is a premium scope with high contrast/high resolution performance and premium a...
View full detailsOriginal price $1,255.00 - Original price $1,255.00Original price$1,255.00$1,255.00 - $1,255.00Current price $1,255.00 -
Original price $1,180.00 - Original price $1,180.00Original price$1,180.00$1,180.00 - $1,180.00Current price $1,180.00Sky-Watcher 10" Quattro 250P Imaging Newtonian S11220
Sky-WatcherIn StockIf you are looking for a large fast optical system to enhance your astro-photography then the Quattro series from Sky-Watcher should fit the bill. ...
View full detailsOriginal price $1,180.00 - Original price $1,180.00Original price$1,180.00$1,180.00 - $1,180.00Current price $1,180.00 -
Original price $2,140.00 - Original price $2,140.00Original price$2,140.00$2,140.00 - $2,140.00Current price $2,140.00Sky-Watcher Starlux 190 Maksutov-Newtonian f/5.3 Optical Tube
Sky-WatcherIn StockThe Sky-Watcher f/5.3 190mm Maksutov-Newtonian optical system is a quality fast focal ratio performer that excels at deep space imaging and viewing...
View full detailsOriginal price $2,140.00 - Original price $2,140.00Original price$2,140.00$2,140.00 - $2,140.00Current price $2,140.00 -
Original price $5,240.00 - Original price $5,240.00Original price$5,240.00$5,240.00 - $5,240.00Current price $5,240.00Takahashi TSA-120 4.7" F/7.5 Ortho-Apochromat Triplet Refractor OTA
TakahashiMore on the wayThis Takahashi TSA-120 4.72" ED triplet refractor puts true-color "super apochromat" optical excellence in a portable 15.4 lb. package. This Takaha...
View full detailsOriginal price $5,240.00 - Original price $5,240.00Original price$5,240.00$5,240.00 - $5,240.00Current price $5,240.00 -
Original price $8,110.00 - Original price $8,110.00Original price$8,110.00$8,110.00 - $8,110.00Current price $8,110.00Takahashi TOA-130NFB 5.1" Ortho-Apochromat Triplet Refractor OTA
TakahashiMore on the wayThis performance of this 4" focuser Takahashi 5.1" ED triplet refractor is too good to let it be called simply an apochromatic scope. Only the term...
View full detailsOriginal price $8,110.00 - Original price $8,110.00Original price$8,110.00$8,110.00 - $8,110.00Current price $8,110.00 -
Original price $7,200.00 - Original price $7,200.00Original price$7,200.00$7,200.00 - $7,200.00Current price $7,200.00Takahashi TOA-130NS 5.1" f/7.7 Ortho-Apochromat Triplet Refractor OTA
TakahashiMore on the wayThis performance of this Takahashi 5.1" ED triplet refractor is too good to let it be called simply an apochromatic scope. Only the term ortho-apoc...
View full detailsOriginal price $7,200.00 - Original price $7,200.00Original price$7,200.00$7,200.00 - $7,200.00Current price $7,200.00 -
Original price $1,799.99 - Original price $1,799.99Original price$1,799.99$1,799.99 - $1,799.99Current price $1,799.99Explore Scientific ES127 127mm f/7.5 "Essential Series" FCD-1 ED Triplet Refractor
Explore ScientificIn StockThis big 127mm (5") Explore Scientific Essential Series air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at ...
View full detailsOriginal price $1,799.99 - Original price $1,799.99Original price$1,799.99$1,799.99 - $1,799.99Current price $1,799.99 -
Original price $8,250.00 - Original price $8,250.00Original price$8,250.00$8,250.00 - $8,250.00Current price $8,250.00Sky-Watcher Esprit 150mm f/7 Ed Apochromatic Triplet Refractor With Field Flattener S11430
Sky-WatcherMore on the wayThe big Sky-Watcher Esprit 150mm ED apochromatic triplet refractor with thread-on field flattener combines premium high contrast/high resolution im...
View full detailsOriginal price $8,250.00 - Original price $8,250.00Original price$8,250.00$8,250.00 - $8,250.00Current price $8,250.00 -
Original price $3,499.00 - Original price $3,499.00Original price$3,499.00$3,499.00 - $3,499.00Current price $3,499.00ZWO FF130 APO Refractor OTA
ZWOMore on the wayThe ZWO FF130 APO is a high-performance 130mm f/7.7 quadruplet refractor designed to meet the needs of astrophotographers and visual observers who ...
View full detailsOriginal price $3,499.00 - Original price $3,499.00Original price$3,499.00$3,499.00 - $3,499.00Current price $3,499.00 -
Original price $5,999.99 - Original price $5,999.99Original price$5,999.99$5,999.99 - $5,999.99Current price $5,999.99
Explore Scientific 140mm f/6.7 FPL-53 Carbon Fiber APO Triplet Refractor With 3" Hexagonal Focuser
Explore ScientificSold Out140mm has long been considered the perfect size for an APO refractor. Explore Scientific makes that size a reality with fantastic optics and mechan...
View full detailsOriginal price $5,999.99 - Original price $5,999.99Original price$5,999.99$5,999.99 - $5,999.99Current price $5,999.99Sold out -
Original price $4,100.00 - Original price $4,100.00Original price$4,100.00$4,100.00 - $4,100.00Current price $4,100.00Sky-Watcher Evostar 150DX 150mm Apochomatic Refractor Optical Tube S11195
Sky-WatcherIn StockThe Sky-Watcher Evostar 150DX is one of the most affordable 6" ED doublet refractors available today with a large format rack and pinion focuser. S...
View full detailsOriginal price $4,100.00 - Original price $4,100.00Original price$4,100.00$4,100.00 - $4,100.00Current price $4,100.00 -
Original price $1,795.00 - Original price $1,795.00Original price$1,795.00$1,795.00 - $1,795.00Current price $1,795.00Astro-Tech 10" f/4 Carbon Fiber Truss-Tube Imaging Newtonian
Astro-TechMore on the wayFor serious deep space astrophotographers, this Sky & Telescope 2016 Hot Product 10" Astro-Tech AT10INT carbon fiber truss tube imaging Newtoni...
View full detailsOriginal price $1,795.00 - Original price $1,795.00Original price$1,795.00$1,795.00 - $1,795.00Current price $1,795.00 -
Original price $1,815.00 - Original price $1,815.00Original price$1,815.00$1,815.00 - $1,815.00Current price $1,815.00Sky-Watcher 12" Quattro 300P Imaging Newtonian S11230
Sky-WatcherMore on the wayThe Sky-Watcher 12" Quattro will bring your imaging into the next level. The Sky-Watcher 12" f/4 Quattro Imaging Newtonian has . . . 305mm apertu...
View full detailsOriginal price $1,815.00 - Original price $1,815.00Original price$1,815.00$1,815.00 - $1,815.00Current price $1,815.00
