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Due to the USA–China tariff escalation, we will temporarily not receive additional inventory for Celestron and Sky-Watcher products. As a result, we are unable to accept orders for any out-of-stock items and encourage you to take advantage of the products currently in stock while supplies last.
Due to the USA–China tariff escalation, we will temporarily not receive additional inventory for Celestron and Sky-Watcher products. As a result, we are unable to accept orders for any out-of-stock items and encourage you to take advantage of the products currently in stock while supplies last.

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Diagonals

  • Original price $296.00 USD - Original price $296.00 USD
    Original price
    $296.00 USD
    $296.00 USD - $296.00 USD
    Current price $296.00 USD

    APM 90° Erect Image Prism - 2"

    APM-2-diag-EI-PR-FL

    APM 2 inch Erect-Image-prism with fast-lock and ultra broadband coatingThe erecting-prism is produced by APM-Telescopes with highest qualityThis e...

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    Original price $296.00 USD - Original price $296.00 USD
    Original price
    $296.00 USD
    $296.00 USD - $296.00 USD
    Current price $296.00 USD
  • Original price $181.00 USD - Original price $181.00 USD
    Original price
    $181.00 USD
    $181.00 USD - $181.00 USD
    Current price $181.00 USD

    APM Dielectric Mirror Star Diagonal - 2"

    APM-2-diag-DX-FL
    2 in stock

    APM 2 inch star diagonal mirror with 99% di-electric coating with fast-lockThe diagonal mirror is produced by APM-Telescopes with highest qualityOp...

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    Original price $181.00 USD - Original price $181.00 USD
    Original price
    $181.00 USD
    $181.00 USD - $181.00 USD
    Current price $181.00 USD
  • Original price $221.00 USD - Original price $221.00 USD
    Original price
    $221.00 USD
    $221.00 USD - $221.00 USD
    Current price $221.00 USD

    APM Prism Diagonal - 2"

    APM-2-diag-PR-FL

    APM 2 inch Diagonalprism with fast-lock and ultra broadband coatingThe prism is produced by APM-Telescopes with highest qualityOpticsHighest preci...

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    Original price $221.00 USD - Original price $221.00 USD
    Original price
    $221.00 USD
    $221.00 USD - $221.00 USD
    Current price $221.00 USD
  • Original price $92.00 USD - Original price $92.00 USD
    Original price
    $92.00 USD
    $92.00 USD - $92.00 USD
    Current price $92.00 USD

    Baader 45° Amici Prism Diagonal w/ 24mm Clear Aperture - 1.25"

    BAA-2956150

    Much larger prism than other so-called "Erecting prisms" Many Erect image prisms have only 19 mm free passage opening and therefore are not suitab...

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    Original price $92.00 USD - Original price $92.00 USD
    Original price
    $92.00 USD
    $92.00 USD - $92.00 USD
    Current price $92.00 USD
  • Original price $239.00 USD - Original price $239.00 USD
    Original price
    $239.00 USD
    $239.00 USD - $239.00 USD
    Current price $239.00 USD

    Baader 45° Amici Prism Diagonal 45° - 2" SCT Thread

    BAA-2956151

    2" SC-thread and 2"/1¼"-reducer Direct attachment to Schmidt-Cassegrains Correct image orientation Excellent for terrestrial viewing

    Original price $239.00 USD - Original price $239.00 USD
    Original price
    $239.00 USD
    $239.00 USD - $239.00 USD
    Current price $239.00 USD
  • Original price $719.00 USD - Original price $719.00 USD
    Original price
    $719.00 USD
    $719.00 USD - $719.00 USD
    Current price $719.00 USD

    Baader 90° Astro-Grade Amici Prism w/ BBHS Coating - 2" ClickLock

    BAA-2456120

    2" ClickLock-Clamp and 2" nosepiece Correct image orientation Suited for astronomical observation at high magnification Hard-silver-coated and pro...

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    Original price $719.00 USD - Original price $719.00 USD
    Original price
    $719.00 USD
    $719.00 USD - $719.00 USD
    Current price $719.00 USD
  • Original price $319.00 USD - Original price $319.00 USD
    Original price
    $319.00 USD
    $319.00 USD - $319.00 USD
    Current price $319.00 USD

    Baader 90° Astro-Grade Amici Prism w/ BBHS Coating - T-2

    BAA-2456130
    1 in stock

    T-2/90° Baader Roof-Prism. Manufactured by Zeiss standard, both sides with T-2 system threads. This Prism is multicoated and built in a solid meta...

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    Original price $319.00 USD - Original price $319.00 USD
    Original price
    $319.00 USD
    $319.00 USD - $319.00 USD
    Current price $319.00 USD
  • Original price $299.00 USD - Original price $299.00 USD
    Original price
    $299.00 USD
    $299.00 USD - $299.00 USD
    Current price $299.00 USD

    Baader 90° Erecting Prism Diagonal - 2"

    BAA-2956152

    90 ° Amici-erecting-prism with 2 "eyepiece and 2" barrel Including Reduction 2 "to 1¼" Excellent for terrestrial viewing with 2 "eyepieces Not sui...

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    Original price $299.00 USD - Original price $299.00 USD
    Original price
    $299.00 USD
    $299.00 USD - $299.00 USD
    Current price $299.00 USD
  • Original price $141.00 USD - Original price $141.00 USD
    Original price
    $141.00 USD
    $141.00 USD - $141.00 USD
    Current price $141.00 USD

    Baader 90° Prism Diagonal w/ 32mm Prism - T-2

    BAA-2456005

    High-quality Zenith Prism T-2/90 ° with 32mm Prism Rigid metal body Connection objective side: T-2 internal thread Connection eyepiece: T-2 extern...

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    Original price $141.00 USD - Original price $141.00 USD
    Original price
    $141.00 USD
    $141.00 USD - $141.00 USD
    Current price $141.00 USD
  • Original price $169.00 USD - Original price $169.00 USD
    Original price
    $169.00 USD
    $169.00 USD - $169.00 USD
    Current price $169.00 USD

    Baader 90° Zenith Prism Diagonal w/ 32mm Prism - 1.25"

    BAA-2456005K

    Includes: T-2/32 Diagonal with focusing 1¼" eyepiece clamp (#2458125) and 1¼" nose piece (#2458105) High-quality Zenith Prism T-2/90 ° with 32mm P...

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    Original price $169.00 USD - Original price $169.00 USD
    Original price
    $169.00 USD
    $169.00 USD - $169.00 USD
    Current price $169.00 USD
  • Original price $272.00 USD - Original price $272.00 USD
    Original price
    $272.00 USD
    $272.00 USD - $272.00 USD
    Current price $272.00 USD

    Baader FlipMirror II Star Diagonal

    BAA-2458055

    Baader-FlipMirror II Star Diagonal (BFM II) with three ports: Straight-through (S52, M48 and T-2 on both sides) for full-frame camera, spectrograp...

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    Original price $272.00 USD - Original price $272.00 USD
    Original price
    $272.00 USD
    $272.00 USD - $272.00 USD
    Current price $272.00 USD
  • Original price $60.00 USD - Original price $60.00 USD
    Original price
    $60.00 USD
    $60.00 USD - $60.00 USD
    Current price $60.00 USD

    Baader M55/M68 Adapter for 2" Baader Mirrors & Prisms

    BAA-2956110

    Baader M55a / M68a (Zeiss) adapter for all Baader 2" mirror and prism star diagonals, for direct connection to the M68 Zeiss thread With this adap...

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    Original price $60.00 USD - Original price $60.00 USD
    Original price
    $60.00 USD
    $60.00 USD - $60.00 USD
    Current price $60.00 USD
  • Original price $122.00 USD - Original price $122.00 USD
    Original price
    $122.00 USD
    $122.00 USD - $122.00 USD
    Current price $122.00 USD

    Baader Maxbright Amici Prism 1.25"w/ Integral 2X Glasspath Corrector

    BAA-2956155

    45 ° an erecting prism Amici Including 2x Glaswegkorrektor ™ (Glass Path Corrector) and 1¼ "barrel Suitable for all SC telescopes and refractors O...

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    Original price $122.00 USD - Original price $122.00 USD
    Original price
    $122.00 USD
    $122.00 USD - $122.00 USD
    Current price $122.00 USD
  • Original price $249.00 USD - Original price $249.00 USD
    Original price
    $249.00 USD
    $249.00 USD - $249.00 USD
    Current price $249.00 USD

    Baader Maxbright Mirror Diagonal - T-2

    BAA-2456100

    1¼ "Maxbright Universal Star Diagonal Sitall mirror material (glass ceramic with zero expansion coefficient), 1/10 lambda surface finish 140 coati...

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    Original price $249.00 USD - Original price $249.00 USD
    Original price
    $249.00 USD
    $249.00 USD - $249.00 USD
    Current price $249.00 USD
  • Original price $309.00 USD - Original price $309.00 USD
    Original price
    $309.00 USD
    $309.00 USD - $309.00 USD
    Current price $309.00 USD

    Baader Mirror Diagonal - 2" ClickLock

    BAA-2956100

    With their ground-breaking introduction several years ago of the all-dielectric 2" Maxbright star diagonal, Baader Planetarium brought mirror star ...

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    Original price $309.00 USD - Original price $309.00 USD
    Original price
    $309.00 USD
    $309.00 USD - $309.00 USD
    Current price $309.00 USD
  • Original price $499.00 USD - Original price $499.00 USD
    Original price
    $499.00 USD
    $499.00 USD - $499.00 USD
    Current price $499.00 USD

    Baader Mirror Diagonal w/ BBHS Coating - 2" ClickLock

    BAA-2456115

    2" BBHS star diagonal with 2" ClickLock terminal and black case. Provides greatest reflectance over most spectral range from 390 to 2000nm New inc...

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    Original price $499.00 USD - Original price $499.00 USD
    Original price
    $499.00 USD
    $499.00 USD - $499.00 USD
    Current price $499.00 USD
  • Original price $299.00 USD - Original price $299.00 USD
    Original price
    $299.00 USD
    $299.00 USD - $299.00 USD
    Current price $299.00 USD

    Baader Mirror Diagonal w/ BBHS Coating - T-2

    BAA-2456103

    T-2 BBHS star diagonal withT-2 threads for compatibility with all Baader's Astro T2 system of parts Provides high reflectance over a wide spectral...

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    Original price $299.00 USD - Original price $299.00 USD
    Original price
    $299.00 USD
    $299.00 USD - $299.00 USD
    Current price $299.00 USD
  • Original price $63.00 USD - Original price $63.00 USD
    Original price
    $63.00 USD
    $63.00 USD - $63.00 USD
    Current price $63.00 USD

    Baader Q-Turret Quad Eyepiece Revolver - 1.25"

    BAA-2957010

    The Baader Q-Turret enables quick changing between the different 1.25-inch eyepieces or a planetary camera. It fits most refractors and Schmidt-Cas...

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    Original price $63.00 USD - Original price $63.00 USD
    Original price
    $63.00 USD
    $63.00 USD - $63.00 USD
    Current price $63.00 USD
  • Original price $569.00 USD - Original price $569.00 USD
    Original price
    $569.00 USD
    $569.00 USD - $569.00 USD
    Current price $569.00 USD

    Baader Star Diagonal Prism w/ Zeiss Spec Prism & BBHS Coating - 2" ClickLock

    BAA-2456117

    2" BBHS prism star diagonal (BaK4 glass) with 2" ClickLock clamp and black body. High-quality Zeiss-spec prism produced according to Zeiss standar...

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    Original price $569.00 USD - Original price $569.00 USD
    Original price
    $569.00 USD
    $569.00 USD - $569.00 USD
    Current price $569.00 USD
  • Original price $290.00 USD - Original price $290.00 USD
    Original price
    $290.00 USD
    $290.00 USD - $290.00 USD
    Current price $290.00 USD

    Baader Star Diagonal Prism w/ Zeiss Spec Prism & BBHS Coating - T-2

    BAA-2456095

    T-2/90 ° diagonal prism (BaK4 glass) with 35mm free aperture terminal objective side: 2 "or 1¼" Connection eyepiece: 1¼ " Prism made in accordance...

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    Original price $290.00 USD - Original price $290.00 USD
    Original price
    $290.00 USD
    $290.00 USD - $290.00 USD
    Current price $290.00 USD
  • Original price $43.95 USD - Original price $43.95 USD
    Original price
    $43.95 USD
    $43.95 USD - $43.95 USD
    Current price $43.95 USD

    Celestron 45-Degree Erect Image Diagonal

    CEL-94112-A

    Features A great accessory for daytime terrestrial viewing with your telescope This 1.25" diagonal produces right side up and left-to-right correct...

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    Original price $43.95 USD - Original price $43.95 USD
    Original price
    $43.95 USD
    $43.95 USD - $43.95 USD
    Current price $43.95 USD
    Sold out
  • Original price $154.95 USD - Original price $154.95 USD
    Original price
    $154.95 USD
    $154.95 USD - $154.95 USD
    Current price $154.95 USD

    Celestron Dielectric Star Diagonal with Twist-Lock - 1.25"

    CEL-93571

    Features Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings Provides...

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    Original price $154.95 USD - Original price $154.95 USD
    Original price
    $154.95 USD
    $154.95 USD - $154.95 USD
    Current price $154.95 USD
    Sold out
  • Original price $249.95 USD - Original price $249.95 USD
    Original price
    $249.95 USD
    $249.95 USD - $249.95 USD
    Current price $249.95 USD

    Celestron Dielectric Star Diagonal with Twist-Lock - 2"

    CEL-93573
    Only 3 left!

    Features Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings Provides...

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    Original price $249.95 USD - Original price $249.95 USD
    Original price
    $249.95 USD
    $249.95 USD - $249.95 USD
    Current price $249.95 USD
  • Original price $179.95 USD - Original price $179.95 USD
    Original price
    $179.95 USD
    $179.95 USD - $179.95 USD
    Current price $179.95 USD

    Celestron Mirror Diagonal with XLT Coatings - 2"

    CEL-93527

    Features 2" SCT mirror diagonal with high performance XLT coatings 1/10th wave mirror is tested with an interferometer to ensure quality Housing is...

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    Original price $179.95 USD - Original price $179.95 USD
    Original price
    $179.95 USD
    $179.95 USD - $179.95 USD
    Current price $179.95 USD
    Sold out