Skip to content
Trusted advice since 1979 Excellent 4.5 rating on Google Reviews Free Shipping On Orders Over $100

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.

Filters

$
$
  • $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...

    View full details
    $1,899.00 - $1,899.00
    $1,899.00
    $1,899.00 - $1,899.00
    $1,899.00
  • 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...

    View full details
    $979.99 - $979.99
    $979.99
    $979.99 - $979.99
    $979.99
  • Astro-Tech 6" f/9 Ritchey-Chrétien astrograph
    Sold out
    $479.95 - $479.95
    $479.95
    $479.95 - $479.95
    $479.95

    Astro-Tech 6" f/9 Ritchey-Chrétien Astrograph

    Astro-Tech
    Sold Out

    The exceptional value 6" Astro-Tech Ritchey-Chrétien astrograph is once again available for the serious deep space astrophotographer on a budget . ...

    View full details
    $479.95 - $479.95
    $479.95
    $479.95 - $479.95
    $479.95
    Sold out
  • $4,395.00 - $4,395.00
    $4,395.00
    $4,395.00 - $4,395.00
    $4,395.00

    Astro-Tech AT152EDT f/8 Triplet APO Refractor OTA

    Astro-Tech
    More on the way

    The Astro-Tech AT152EDT 152mm f/8 Triplet Apochromatic Refractor – A True Lifetime Telescope  For those who demand the best in optical performance ...

    View full details
    $4,395.00 - $4,395.00
    $4,395.00
    $4,395.00 - $4,395.00
    $4,395.00
  • $880.00 - $880.00
    $880.00
    $880.00 - $880.00
    $880.00

    Sky-Watcher Skymax 150 150mm f/12 Maksutov-Cassegrain Optical Tube S11530

    Sky-Watcher
    In Stock

    The Sky-Watcher 150mm (5.9") Maksutov-Cassegrain folded optical system is a compact optical powerhouse capable of producing sharp, high contrast im...

    View full details
    $880.00 - $880.00
    $880.00
    $880.00 - $880.00
    $880.00
  • $2,995.00 - $2,995.00
    $2,995.00
    $2,995.00 - $2,995.00
    $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...

    View full details
    $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...

    View full details
    $999.00 - $999.00
    $999.00
    $999.00 - $999.00
    $999.00
  • $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...

    View full details
    $3,195.00 - $3,195.00
    $3,195.00
    $3,195.00 - $3,195.00
    $3,195.00
  • $839.95 - $839.95
    $839.95
    $839.95 - $839.95
    $839.95

    Celestron 6" SCT Optical Tube, CG5/AVX Dovetail

    Celestron
    More on the way

    This 6" SCT optical tube has advanced Starbright XLT multicoatings for Celestron's brightest images ever. The Celestron C8 was the first Schmidt-Ca...

    View full details
    $839.95 - $839.95
    $839.95
    $839.95 - $839.95
    $839.95
  • $2,990.00 - $2,990.00
    $2,990.00
    $2,990.00 - $2,990.00
    $2,990.00

    Takahashi Epsilon E-130D Astrograph

    Takahashi
    More on the way

    Wide-field imagers rejoice!  The Takahashi Epsilon E-130D telescope is an incredible wide-field imaging machine. The Epsilon series of astrographs ...

    View full details
    $2,990.00 - $2,990.00
    $2,990.00
    $2,990.00 - $2,990.00
    $2,990.00
  • $8,250.00 - $8,250.00
    $8,250.00
    $8,250.00 - $8,250.00
    $8,250.00

    Sky-Watcher Esprit 150mm f/7 Ed Apochromatic Triplet Refractor With Field Flattener S11430

    Sky-Watcher
    More on the way

    The big Sky-Watcher Esprit 150mm ED apochromatic triplet refractor with thread-on field flattener combines premium high contrast/high resolution im...

    View full details
    $8,250.00 - $8,250.00
    $8,250.00
    $8,250.00 - $8,250.00
    $8,250.00
  • 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...

    View full details
    $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...

    View full details
    $4,100.00 - $4,100.00
    $4,100.00
    $4,100.00 - $4,100.00
    $4,100.00
  • $4,499.99 - $4,499.99
    $4,499.99
    $4,499.99 - $4,499.99
    $4,499.99

    Explore Scientific 152mm f/8 FCD-1 ED Triplet Refractor, Carbon Fiber, 2.5" Hex Rack And Pinion Focuser

    Explore Scientific
    In Stock

    This big and optically excellent 152mm (6") Explore Scientific air-spaced ED triplet apochromatic refractor has a carbon fiber body and a 2.5" Hex ...

    View full details
    $4,499.99 - $4,499.99
    $4,499.99
    $4,499.99 - $4,499.99
    $4,499.99
  • $595.00 - $595.00
    $595.00
    $595.00 - $595.00
    $595.00

    Sky-Watcher Quattro 150P Imaging Newtonian S11205

    Sky-Watcher
    More on the way

    Sky-Watcher Quattro 150P Imaging Newtonian Reflector The Sky-Watcher Quattro 150P is a fast, precision-engineered Newtonian reflector designed from...

    View full details
    $595.00 - $595.00
    $595.00
    $595.00 - $595.00
    $595.00
  • $848.00 - $848.00
    $848.00
    $848.00 - $848.00
    $848.00

    iOptron 6" Maksutov Cassegrain Optical Tube

    iOptron
    More on the way

    Enjoy scanning the night skies with this fantastic 6" iOptron Maksutov. The iOptron® Rumak-type 150mm Maksutov-Cassegrain is perfect for the seriou...

    View full details
    $848.00 - $848.00
    $848.00
    $848.00 - $848.00
    $848.00

Compare products

0 of 3 items selected

Select first item to compare

Select second item to compare

Select third item to compare

Compare