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OTA

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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    $1,399.00
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    Astro-Tech AT115EDT f/7 ED Triplet Refractor OTA

    Astro-Tech
    In Stock

    The Astro-Tech AT115EDT 4.53" f/7 ED triplet apochromatic refractor offers more performance and features than similarly-priced smaller aperture com...

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    $0.00 - $0.00
    $0.00
    $1,399.00
    $1,399.00 - $1,399.00
    $1,399.00
  • $1,899.00 - $1,899.00
    $1,899.00
    $1,899.00 - $1,899.00
    $1,899.00

    Astro-Tech AT130 EDT f/7 ED Triplet OTA

    Astro-Tech
    In Stock

    Some observers feel that the Astro-Tech AT130EDT 5.12" f/7 ED triplet apochromatic refractor compares favorably in performance to scopes nearly fou...

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    $1,899.00 - $1,899.00
    $1,899.00
    $1,899.00 - $1,899.00
    $1,899.00
  • $1,849.00 - $1,849.00
    $1,849.00
    $1,849.00 - $1,849.00
    $1,849.00

    Astro-Tech AT125EDL Refractor OTA FCD-100 and Lanthanum f/7.8 Doublet

    Astro-Tech
    In Stock

    The 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...

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    $1,849.00 - $1,849.00
    $1,849.00
    $1,849.00 - $1,849.00
    $1,849.00
  • AR152 6" f/6.5 achromatic doublet refractor optical tube
    $979.99 - $979.99
    $979.99
    $979.99 - $979.99
    $979.99

    Explore Scientific AR152 6" f/6.5 Achromatic Doublet Refractor Optical Tube

    Explore Scientific
    More on the way

    This 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...

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    $979.99 - $979.99
    $979.99
    $979.99 - $979.99
    $979.99
  • $2,999.99 - $2,999.99
    $2,999.99
    $2,999.99 - $2,999.99
    $2,999.99

    Explore Scientific 127mm f/7.5 Carbon Fiber FCD100 ED Triplet Refractor

    Explore Scientific
    In Stock

    This big 127mm (5") Explore Scientific Carbon Fiber air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at a su...

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    $2,999.99 - $2,999.99
    $2,999.99
    $2,999.99 - $2,999.99
    $2,999.99
  • $2,995.00 - $2,995.00
    $2,995.00
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    $2,995.00

    Astro-Tech AT150EDL Refractor OTA FCD-100 and Lanthanum f/8 Doublet with Hard Case

    Astro-Tech
    In Stock

    The 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...

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    $2,995.00 - $2,995.00
    $2,995.00
    $2,995.00 - $2,995.00
    $2,995.00
  • 6" F/8 achromatic doublet refractor optical tube, CG5/AVX dovetail
    $999.00 - $999.00
    $999.00
    $999.00 - $999.00
    $999.00

    Celestron 6" f/8 Achromatic Doublet Refractor Optical Tube, CG5/AVX Dovetail

    Celestron
    More on the way

    Here's a sensational value - a big 6" (150mm) achromatic refractor optical tube that's priced like other manufacturers' 80mm scopes.  This Celestro...

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    $999.00 - $999.00
    $999.00
    $999.00 - $999.00
    $999.00
  • $2,499.00 - $2,499.00
    $2,499.00
    $2,499.00 - $2,499.00
    $2,499.00

    Explore Scientific 127mm f/7.5 Classic White FCD100 ED Triplet Refractor

    Explore Scientific
    In Stock

    This big 127mm (5") Explore Scientific Essential Series air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at ...

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    $2,499.00 - $2,499.00
    $2,499.00
    $2,499.00 - $2,499.00
    $2,499.00
  • $4,165.00 - $4,165.00
    $4,165.00
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    $4,165.00

    Sky-Watcher Esprit 120mm f/7 ED Apochromatic Triplet Refractor With Field Flattener S11420

    Sky-Watcher
    In Stock

    The big Sky-Watcher Esprit 120mm ED apochromatic triplet refractor with thread-on field flattener combines premium high contrast/high resolution im...

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    $4,165.00 - $4,165.00
    $4,165.00
    $4,165.00 - $4,165.00
    $4,165.00
  • $2,490.00 - $2,490.00
    $2,490.00
    $2,490.00 - $2,490.00
    $2,490.00

    Sky-Watcher Evostar 120mm f/7.5 ED Doublet Apochromatic Refractor S11130

    Sky-Watcher
    In Stock

    This 120mm Sky-Watcher Evostar 120ED is a premium doublet apochromatic refractor with highly-reviewed high contrast/high resolution optics that Sky...

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    $2,490.00 - $2,490.00
    $2,490.00
    $2,490.00 - $2,490.00
    $2,490.00
  • $3,195.00 - $3,195.00
    $3,195.00
    $3,195.00 - $3,195.00
    $3,195.00

    Astro-Tech AT130EDX f/7 FCD100 ED Triplet APO

    Astro-Tech
    In Stock

    The 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...

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    $3,195.00 - $3,195.00
    $3,195.00
    $3,195.00 - $3,195.00
    $3,195.00
  • TOA-130NFB 5.1" Ortho-Apochromat Triplet Refractor OTA
    $8,110.00 - $8,110.00
    $8,110.00
    $8,110.00 - $8,110.00
    $8,110.00

    Takahashi TOA-130NFB 5.1" Ortho-Apochromat Triplet Refractor OTA

    Takahashi
    More on the way

    This 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...

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    $8,110.00 - $8,110.00
    $8,110.00
    $8,110.00 - $8,110.00
    $8,110.00
  • TOA-130S 5.1" F/7.7 Ortho-Apochromat Triplet Refractor OTA
    $7,200.00 - $7,200.00
    $7,200.00
    $7,200.00 - $7,200.00
    $7,200.00

    Takahashi TOA-130NS 5.1" f/7.7 Ortho-Apochromat Triplet Refractor OTA

    Takahashi
    More on the way

    This 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...

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    $7,200.00 - $7,200.00
    $7,200.00
    $7,200.00 - $7,200.00
    $7,200.00
  • ES127 127mm f/7.5 "Essential Series" ED triplet refractor
    $1,799.99 - $1,799.99
    $1,799.99
    $1,799.99 - $1,799.99
    $1,799.99

    Explore Scientific ES127 127mm f/7.5 "Essential Series" FCD-1 ED Triplet Refractor

    Explore Scientific
    In Stock

    This big 127mm (5") Explore Scientific Essential Series air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at ...

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    $1,799.99 - $1,799.99
    $1,799.99
    $1,799.99 - $1,799.99
    $1,799.99
  • $3,499.00 - $3,499.00
    $3,499.00
    $3,499.00 - $3,499.00
    $3,499.00

    ZWO FF130 APO Refractor OTA

    ZWO
    More on the way

    The ZWO FF130 APO is a high-performance 130mm f/7.7 quadruplet refractor designed to meet the needs of astrophotographers and visual observers who ...

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    $3,499.00 - $3,499.00
    $3,499.00
    $3,499.00 - $3,499.00
    $3,499.00
  • Sold out
    $5,999.99 - $5,999.99
    $5,999.99
    $5,999.99 - $5,999.99
    $5,999.99

    Explore Scientific 140mm f/6.7 FPL-53 Carbon Fiber APO Triplet Refractor With 3" Hexagonal Focuser

    Explore Scientific
    Sold Out

    140mm has long been considered the perfect size for an APO refractor. Explore Scientific makes that size a reality with fantastic optics and mechan...

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    $5,999.99 - $5,999.99
    $5,999.99
    $5,999.99 - $5,999.99
    $5,999.99
    Sold out
  • $4,100.00 - $4,100.00
    $4,100.00
    $4,100.00 - $4,100.00
    $4,100.00

    Sky-Watcher Evostar 150DX 150mm Apochomatic Refractor Optical Tube S11195

    Sky-Watcher
    In Stock

    The 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...

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    $4,100.00 - $4,100.00
    $4,100.00
    $4,100.00 - $4,100.00
    $4,100.00
  • $2,499.00 - $2,499.00
    $2,499.00
    $2,499.00 - $2,499.00
    $2,499.00

    Astro-Tech AT126EDQ f/7 Quad Refractor

    Astro-Tech
    More on the way

    This Astro-Tech AT126EDQ ED refractor has: • 126mm f/7 fully multicoated four-lens/two-group refractor• two ED lens elements• amazing flat field as...

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    $2,499.00 - $2,499.00
    $2,499.00
    $2,499.00 - $2,499.00
    $2,499.00
  • Sold out
    $11,999.99 - $11,999.99
    $11,999.99
    $11,999.99 - $11,999.99
    $11,999.99

    Explore Scientific 165mm f/7 FPL-53 Carbon Fiber APO Triplet Refractor With 3" Hex Focuser

    Explore Scientific
    Sold Out

    Enjoy serious observation with Explore Scientific's flagship telescope, the 165mm FPL-53 refractor. Reveal celestial wonders like the desolate beau...

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    $11,999.99 - $11,999.99
    $11,999.99
    $11,999.99 - $11,999.99
    $11,999.99
    Sold out

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