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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
  • $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
    More on the way

    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
  • 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
  • $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
  • $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
  • $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
  • $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
  • $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
  • $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...

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    $1,799.00 - $1,799.00
    $1,799.00
    $1,799.00 - $1,799.00
    $1,799.00

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