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  • Baader 6.5nm Narrowband Filters – CMOS-optimized (H-alpha / O-III / S-II)

    Baader Planetarium
    from $176.00

    Baader H-alpha / O-III / S-II Narrowband Filter Set - Precision Grade 6.5 nm FWHM, recommended for optical systems from f / 10 to f / 3.5 Refle...

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    from $176.00
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    Baader 8mm Hyperion 68° Modular Eyepiece

    Baader Planetarium
    $217.00

    Baader Hyperion Eyepiece 8mm Huge 68 degree wide angle field, tailored to the maximum Visual angle of the human eye Phantom group coatings in Zeis...

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    $217.00
    In Stock
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    Baader AstroSolar Safety Film

    Baader Planetarium
    $44.00

    Baader Planetarium's AstroSolar™ Safety Film delivers white light views of the Sun that are unmatched by any other objective solar filter or materi...

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    $44.00
    In Stock
  • Baader CMOS-optimized L-RGB Filters Set

    Baader Planetarium
    from $391.00

    New CMOS-optimized L-RGB filters from Baader Planetarium with Reflex-Blocker™ and Life-Coat™. Baader CMOS RGB Bandpass Filter RGB-R (595 – 690 m...

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    from $391.00
  • Baader Neodymium (Moon & Skyglow) Filter 2"

    Baader Planetarium
    $171.00

    Selective contrast filter, for all reflector and refractor telescopes Filters out specific wavelengths, especially those caused by streetlight and...

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    $171.00
  • Baader UV-IR Cut Filter - 1.25"

    Baader Planetarium
    $87.00

    Baader Planetarium has introduced the world's finest UV/IR cut filter. This filter is a must for all digital imaging with Digital Cameras, CCD Came...

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    $87.00
  • Baader UV-IR Cut Filter - 2"

    Baader Planetarium
    $143.00

    Baader Planetarium has introduced the world's finest UV/IR cut filter. This filter is a must for all digital imaging with Digital Cameras, CCD Came...

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    $143.00
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    Bahtinov Mask for Seestar S50

    Starizona
    $9.95

    This cute little Bahtinov mask plugs into the front opening of the ZWO Seestar S50 and help with manual focusing.  3D printed from durable carbon f...

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    $9.95
    In Stock
  • In Stock

    Bats of Western North American: A Comprehensive Guide to All Species

    Quick Reference Publishing, Inc.
    $8.95

    Bats are one of the most unique and mysterious animals on earth. You may have feared them or have been fascinated by them. Either way, you have wan...

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    $8.95
    In Stock
  • In Stock

    Binocular Tripod Adapter – Metal Mounting Bracket

    Dark Matter Optics
    $14.95

    All-metal binocular tripod adapter designed for secure mounting of binoculars to standard photo and telescope tripods. Features 1/4"-20 threading o...

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    $14.95
    In Stock
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    Birds of Mexico and Central America

    Princeton University Press
    $29.95

    Birds of Mexico and Central America is the only field guide to illustrate and describe every species of bird in Central America from Mexico to Pana...

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    $29.95
    In Stock
  • C-to-1.25" Adapter

    Starizona
    $24.95

    This adapter can be used as a 1.25" nosepiece for any camera that has C-mount (1") threads. The adapter has male C-threads on the camera side, and ...

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    $24.95
  • C14 Optical Tube Assembly (CGE Dovetail)

    Celestron
    $6,799.95

      14" Schmidt-Cassegrain Optical Tube Assembly (OTA) Features Celestron's premium patented StarBright XLT optical coatings  3910mm focal length (f...

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    $6,799.95
  • C5 Spotting Scope

    Celestron
    $679.95

    Celestron’s C5 Spotting Scope is a 5" (127mm) aperture, 1250mm f/10 Schmidt-Cassegrain optical system. Its optical excellence is the reason it was ...

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    $679.95
  • C6 Optical Tube Assembly (CG-5 Dovetail)

    Celestron
    $879.95

    6" Schmidt-Cassegrain optical tube assembly (OTA) Features Celestron's premium patented StarBright XLT optical coatings 1500 mm focal length (f/1...

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    $879.95
  • In Stock

    C6 Secondary Mirror Mounting Plate with Knob

    Starizona
    $19.95

    This is a replacement for the secondary mirror mounting plate that is included with the HyperStar 6.

    $19.95
    In Stock
  • C8-A-XLT (CGE) Optical Tube Assembly

    Celestron
    $1,399.95

      8" Schmidt-Cassegrain optical tube assembly (OTA) Features Celestron's premium patented StarBright XLT optical coatings 2032 mm focal length (...

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    $1,399.95
  • C9 1/4-A-XLT (CGE) Optical Tube Assembly (9.25")

    Celestron
    $1,999.95

    9.25" f/10 Schmidt-Cassegrain optical tube. Includes aluminum tube, enhanced XLT coatings, CGE (Losmandy-style) dovetail bar, 25mm Plossl eyepiece,...

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    $1,999.95
  • C90 Mak Spotting Scope

    Celestron
    $279.95

      Multi Coated Optics Maksutov-Cassegrain Optical Design Compact and Portable Design Erect Image System for Terrestrial and Astronomical Use Built...

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    $279.95
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    CAA M42 Male Adapter Plate

    Starizona
    $40.00

    The CAA M42 Male Adapter Plate by Starizona allows for easy adaptation to the ZWO CAA Rotator, providing male M42 threads. Made in the USA, this th...

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    $40.00
    In Stock
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    Camera Plate - T-Adapter w/Filter Holder - EdgeHD 9.25, 11, 14

    Starizona
    $34.95

    This is the top camera adapter plate for our T-Adapter with Filter Holder for large EdgeHD scopes.  The T-adapter normally comes with M42 threads, ...

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    $34.95
    In Stock
  • Canon M-Mount T-Ring

    Celestron
    $25.95

    T-Ring attaches to M-mount Canon mirrorless camera bodies Works with Celestron T-Adapters 42mm female diameter thread Sturdy bayonet flange locks ...

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    $25.95
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    Canon RF Wide T-Ring

    Starizona
    $49.95

    This wide M48-threaded T-ring will fit Canon RF-mount mirrorless cameras.  It is a "T-minus" style ring that is only 10mm thick.  This allows it to...

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    $49.95
    In Stock
  • In Stock

    Car Battery Adapter Power Cord (12v DC)

    Starizona
    $18.95

    12-volt DC power cord to connect Celestron Advanced Series, AVX, CPC, CGE, and NexStar telescopes to battery supply. Cigarette-lighter style plug.

    $18.95
    In Stock
  • Celestial Atlas - Menor

    Ken Press
    $19.95

    Celestial Atlas Menor is a reference and observing guide for those wanting to enjoy the exploration of the heavens with their eyes, binoculars or a...

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    $19.95
  • Celestial Wonder Globe

    Replogle Globes, Inc.
    $12.00

    The Celestial Wonder Globe, featuring stars, constellations, and celestial images rendered by noted German cartographer Karl Harig, offers the exce...

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    $12.00
  • Celestron 0.63x Reducer/Corrector

    Celestron
    $199.95

      Unique focal reducer and field corrector lens accessory Reduces the focal length and f/ ratio of your Schmidt-Cassegrain telescope by 37% Provid...

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    $199.95
  • Celestron 11" Optical Tube Assembly (CGE Dovetail)

    Celestron
    $3,299.95

    11" Schmidt-Cassegrain Optical Tube Assembly (OTA) Features Celestron's premium patented StarBright XLT optical coatings  2800mm focal length (f/1...

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    $3,299.95
  • Celestron 11" Rowe-Ackermann Schmidt Astrograph (RASA11) V2

    Celestron
    $4,499.00

    Capturing impressive deep-sky astroimages is easier than ever with Celestron’s new Rowe-Ackermann Schmidt Astrograph, the perfect companion to toda...

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    $4,499.00
  • In Stock

    Celestron 11-Inch Dovetail Bar (CGE)

    Celestron
    $59.95

    11-inch Dovetail bar (CGE)

    $59.95
    In Stock
  • Celestron 12mm Omni Plossl Eyepiece

    Celestron
    $31.95

    If you are looking to move up to a higher quality eyepiece the Omni series provides more enhanced features in a wider selection of focal lengths. C...

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    $31.95
  • Celestron 14-Inch Dovetail Bar (CGE)

    Celestron
    $80.95

    Dovetail for mounting a Celestron 14" SCT to a Celestron CGE-style or Losmandy D-style saddle plate or for piggybacking a guidescope or camera.

    $80.95
  • Celestron 15mm Omni Eyepiece

    Celestron
    $31.95

      Omni eyepieces offer a quality 4-element Plössl optical design at a super affordable price Rubber eyecups provide comfort and increase contrast....

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    $31.95
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    Celestron 34" Tripod Bag

    Celestron
    $104.95

    The ideal storage and transport solution for a wide range of tripods and their accessory trays with internal straps for a secure fit. Ultra-durabl...

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    $104.95
    In Stock
  • In Stock

    Celestron 6" RASA Optical Tube Assembly

    Celestron
    $1,699.00

    Lightning-Fast Imaging: RASA’s legendary ultra-fast f/2.2 optics let you capture deep-sky images with briefer sub-exposures and less total exposu...

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    $1,699.00
    In Stock
  • In Stock

    Celestron 7 X 50 Cometron Binoculars

    Celestron
    $47.95

    Get ready for the next awe-inspiring comet with a pair of sleek, portable Celestron Cometron 7x50mm binoculars. The large 50mm objective lenses an...

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    $47.95
    In Stock