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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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  • $439.00 - $439.00
    $439.00
    $439.00 - $439.00
    $439.00

    Astro-Tech AT80ED 3.1" f/7 ED Refractor OTA

    Astro-Tech
    In Stock

    This Astro-Tech AT80ED refractor has: 80mm f/7 fully multicoated doublet optics using FK-61 ED glass dual-speed 2" Rack and Pinion rotatable focus...

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    $439.00 - $439.00
    $439.00
    $439.00 - $439.00
    $439.00
  • $649.00 - $649.00
    $649.00
    $649.00 - $649.00
    $649.00

    Astro-Tech AT102ED 4" f/7 ED Refractor OTA

    Astro-Tech
    In Stock

    The Astro-Tech AT102ED is a fantastic value and incredible performer. This Astro-Tech AT102ED refractor has: • 102mm f/7 fully multicoated doublet ...

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    $649.00 - $649.00
    $649.00
    $649.00 - $649.00
    $649.00
  • $0.00 - $0.00
    $0.00
    $899.00
    $899.00 - $899.00
    $899.00

    Astro-Tech AT80EDT f/6 ED Triplet Refractor OTA

    Astro-Tech
    More on the way

    For the backyard grab-and-go observer, for the Milky Way star field scanner, for the wide field imager, for the birder and terrestrial photographer...

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    $0.00 - $0.00
    $0.00
    $899.00
    $899.00 - $899.00
    $899.00
  • $1,199.00 - $1,199.00
    $1,199.00
    $1,199.00 - $1,199.00
    $1,199.00

    Astro-Tech AT102EDL Refractor OTA FCD-100 and Lanthanum f/7 Doublet

    Astro-Tech
    In Stock

    The Astro-Tech AT102EDL 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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    $1,199.00 - $1,199.00
    $1,199.00
    $1,199.00 - $1,199.00
    $1,199.00
  • $1,595.00 - $1,595.00
    $1,595.00
    $1,595.00 - $1,595.00
    $1,595.00

    Astro-Tech AT90CFT Limited Edition f/6 Triplet APO Refractor Carbon Fiber OTA

    Astro-Tech
    In Stock

      This Astro-Tech AT90CFT refractor has: • 90mm f/6 apochromatic triplet optics using an FCD-100 ED element• 2.5" dual-speed rotating rack and pini...

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    $1,595.00 - $1,595.00
    $1,595.00
    $1,595.00 - $1,595.00
    $1,595.00
  • $320.00 - $320.00
    $320.00
    $320.00 - $320.00
    $320.00

    Sky-Watcher Skymax 102 102mm f/12.75 Maksutov-Cassegrain Optical Tube S11510

    Sky-Watcher
    More on the way

    The Sky-Watcher 102mm Maksutov-Cassegrain is an inexpensive step up from a 90mm Mak. This compact optical powerhouse is capable of producing sharp,...

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    $320.00 - $320.00
    $320.00
    $320.00 - $320.00
    $320.00
  • $3,210.00 - $3,210.00
    $3,210.00
    $3,210.00 - $3,210.00
    $3,210.00

    Sky-Watcher Esprit 100mm f/5.5 ED Apochromatic Triplet Refractor With Field Flattener S11410

    Sky-Watcher
    More on the way

    The Sky-Watcher Esprit 100mm ED apochromatic triplet refractor has the premium high contrast/high resolution/flat field optical performance you nee...

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    $3,210.00 - $3,210.00
    $3,210.00
    $3,210.00 - $3,210.00
    $3,210.00
  • AR102 4" f/6.5 achromatic doublet refractor optical tube
    $599.99 - $599.99
    $599.99
    $599.99 - $599.99
    $599.99

    Explore Scientific AR102 4" f/6.5 Achromatic Doublet Refractor Optical Tube

    Explore Scientific
    In Stock

    This Explore Scientific 4" refractor has: Big 4" aperture fully multicoated achromatic doublet refractor optics Collimatable objective lens cell ...

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    $599.99 - $599.99
    $599.99
    $599.99 - $599.99
    $599.99
  • Astro-Tech AT90EDX side view
    Astro-Tech AT90EDX 3 quarter view
    $1,595.00 - $1,595.00
    $1,595.00
    $1,595.00 - $1,595.00
    $1,595.00

    Astro-Tech AT90EDX f/6 Triplet APO Refractor OTA

    Astro-Tech
    In Stock

    This Astro-Tech AT90EDX refractor has: 90mm f/6 apochromatic triplet optics using an FCD-100 ED element guaranteed .95 strehl ratio or higher opti...

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    $1,595.00 - $1,595.00
    $1,595.00
    $1,595.00 - $1,595.00
    $1,595.00
  • $3,490.00 - $3,490.00
    $3,490.00
    $3,490.00 - $3,490.00
    $3,490.00

    Takahashi FC-100DZ Refractor OTA

    Takahashi
    More on the way

    12/26/2024 update Due to overwhelming demand, Takahashi just quoted delivery of March 2025 on this particular model.  We will consider any sale of ...

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    $3,490.00 - $3,490.00
    $3,490.00
    $3,490.00 - $3,490.00
    $3,490.00
  • $2,167.00 - $2,167.00
    $2,167.00
    $2,167.00 - $2,167.00
    $2,167.00

    TeleVue TV-85 3.35" (85mm) f/7 Ivory Tube/Black Trim APO Refractor OTA

    TeleVue
    More on the way

    The Tele Vue TV-85 refractor has a compact body that's small enough and light enough to take anywhere in the world . . . with apochromatic optics t...

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    $2,167.00 - $2,167.00
    $2,167.00
    $2,167.00 - $2,167.00
    $2,167.00
  • $1,099.99 - $1,099.99
    $1,099.99
    $1,099.99 - $1,099.99
    $1,099.99

    Explore Scientific 102mm f/7 "Essential Series" FCD-1 ED Triplet Refractor

    Explore Scientific
    In Stock

    This 102mm (4") Explore Scientific Essential Series air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at a su...

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    $1,099.99 - $1,099.99
    $1,099.99
    $1,099.99 - $1,099.99
    $1,099.99
  • $1,299.99 - $1,299.99
    $1,299.99
    $1,299.99 - $1,299.99
    $1,299.99

    Explore Scientific 80mm f/6 ED Classic White Tube FCD100 Series APO Triplet Refractor

    Explore Scientific
    In Stock

    This 80mm Explore Scientific FCD100 ED triplet apochromatic refractor is loaded with premium glass for outstanding viewing sessions night after nig...

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    $1,299.99 - $1,299.99
    $1,299.99
    $1,299.99 - $1,299.99
    $1,299.99
  • $2,750.00 - $2,750.00
    $2,750.00
    $2,750.00 - $2,750.00
    $2,750.00

    Takahashi FC-100DF Refractor OTA

    Takahashi
    More on the way

    12/26/2024 update Due to overwhelming demand, Takahashi just quoted delivery of March 2025 on this particular model.  We will consider any sale ...

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    $2,750.00 - $2,750.00
    $2,750.00
    $2,750.00 - $2,750.00
    $2,750.00
  • $2,510.00 - $2,510.00
    $2,510.00
    $2,510.00 - $2,510.00
    $2,510.00

    Takahashi FC-100DC Refractor Optical Tube

    Takahashi
    More on the way

    12/26/2024 update Due to overwhelming demand, Takahashi just quoted delivery of March 2025 on this particular model.  We will consider any sale o...

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    $2,510.00 - $2,510.00
    $2,510.00
    $2,510.00 - $2,510.00
    $2,510.00
  • $799.99 - $799.99
    $799.99
    $799.99 - $799.99
    $799.99

    Explore Scientific ES80 80mm f/6 ED "Essential Series" FCD-1 ED APO Triplet Refractor

    Explore Scientific
    In Stock

    This 80mm Explore Scientific "Essential Series" ED triplet apochromatic refractor is loaded with features and is priced hundreds of dollars less th...

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    $799.99 - $799.99
    $799.99
    $799.99 - $799.99
    $799.99
  • $1,080.00 - $1,080.00
    $1,080.00
    $1,080.00 - $1,080.00
    $1,080.00

    Sky-Watcher Evostar 80ED 80mm f/7.5 ED Doublet Apochromatic Refractor S11100

    Sky-Watcher
    In Stock

    This 80mm Sky-Watcher Evostar 80ED doublet apochromatic refractor is loaded with performance and features at a very attractive price . . . This Sky...

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    $1,080.00 - $1,080.00
    $1,080.00
    $1,080.00 - $1,080.00
    $1,080.00
  • $1,255.00 - $1,255.00
    $1,255.00
    $1,255.00 - $1,255.00
    $1,255.00

    Sky-Watcher Evostar 100ED 100mm f/9 ED Doublet Apochromatic Refractor S11120

    Sky-Watcher
    In Stock

    This 100mm Sky-Watcher Evostar 100ED doublet apochromatic refractor is a premium scope with high contrast/high resolution performance and premium a...

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    $1,255.00 - $1,255.00
    $1,255.00
    $1,255.00 - $1,255.00
    $1,255.00
  • $2,249.99 - $2,249.99
    $2,249.99
    $2,249.99 - $2,249.99
    $2,249.99

    Explore Scientific 102mm f/7 Carbon Fiber FCD100 ED Triplet Refractor

    Explore Scientific
    In Stock

    This 102mm (4") Explore Scientific Carbon Fiber air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at a surpri...

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    $2,249.99 - $2,249.99
    $2,249.99
    $2,249.99 - $2,249.99
    $2,249.99
  • $2,167.00 - $2,167.00
    $2,167.00
    $2,167.00 - $2,167.00
    $2,167.00

    TeleVue TV-85 3.35" (85mm) f/7 Evergreen Tube/Black Trim APO Refractor OTA

    TeleVue
    More on the way

    The TV-85 has a 2" dual-speed rack and pinion focuser with a brass non-marring clamp ring to hold star diagonals and accessories in place. It comes...

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    $2,167.00 - $2,167.00
    $2,167.00
    $2,167.00 - $2,167.00
    $2,167.00
  • $2,230.00 - $2,230.00
    $2,230.00
    $2,230.00 - $2,230.00
    $2,230.00

    Sky-Watcher Esprit 80mm f/5 ED Apochromatic Triplet Refractor With Field Flattener S11400

    Sky-Watcher
    In Stock

    The compact Sky-Watcher Esprit 80mm ED apochromatic triplet refractor has the premium high contrast/high resolution optical performance you need to...

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    $2,230.00 - $2,230.00
    $2,230.00
    $2,230.00 - $2,230.00
    $2,230.00
  • $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00

    Astro-Tech AT86EDQ f/7 Quad Refractor

    Astro-Tech
    In Stock

    This Astro-Tech AT86EDQ ED refractor has: 86mm f/7 fully multicoated four-lens/two-group refractor two ED lens elements amazing flat field astrop...

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    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
  • NP101Is 4" f/5.4 Nagler-Petzval apochromatic refractor
    $4,267.00 - $4,267.00
    $4,267.00
    $4,267.00 - $4,267.00
    $4,267.00

    TeleVue NP101Is 4" f/5.4 Nagler-Petzval Apochromatic Refractor

    TeleVue
    More on the way

    This TeleVue NP-101is is a superb and highly portable apochromatic refractor for both visual observing and imaging . . . This updated and improved ...

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    $4,267.00 - $4,267.00
    $4,267.00
    $4,267.00 - $4,267.00
    $4,267.00
  • $1,799.00 - $1,799.00
    $1,799.00
    $1,799.00 - $1,799.00
    $1,799.00

    Explore Scientific 102mm f/7 Classic White FCD100 ED Triplet Refractor

    Explore Scientific
    In Stock

    This 102mm (4") Explore Scientific Essential Series air-spaced ED triplet apochromatic refractor is loaded with quality optical performance at a su...

    View full details
    $1,799.00 - $1,799.00
    $1,799.00
    $1,799.00 - $1,799.00
    $1,799.00

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