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Diagonals & Prisms

  • Original price $129.95 - Original price $129.95
    Original price
    $129.95
    $129.95 - $129.95
    Current price $129.95

    Astro-Tech 2" 99% Reflectivity Dielectric Mirror Diagonal For Refractors

    Astro-Tech
    In Stock

    This 2” dielectric mirror-type star diagonal is an outstanding value. At this low price, if there ever was a bargain in astronomy, this is it. This...

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    Original price $129.95 - Original price $129.95
    Original price
    $129.95
    $129.95 - $129.95
    Current price $129.95
  • Original price $79.95 - Original price $79.95
    Original price
    $79.95
    $79.95 - $79.95
    Current price $79.95

    Astro-Tech 1.25" 99% Reflectivity Dielectric Mirror Diagonal

    Astro-Tech
    In Stock

    This 1.25" Astro-Tech first-surface mirror star diagonal was named a Sky & Telescope Hot Product for 2007! Sky & Tel recognized that the As...

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    Original price $79.95 - Original price $79.95
    Original price
    $79.95
    $79.95 - $79.95
    Current price $79.95
  • Original price $149.95 - Original price $149.95
    Original price
    $149.95
    $149.95 - $149.95
    Current price $149.95

    Astro-Tech 2" 99% Reflectivity Dielectric Mirror Diagonal for SCTs

    Astro-Tech
    In Stock

    This 2" dielectric mirror-type star diagonal is designed to give you first-class performance with a Schmidt-Cassegrain - at a money-saving and far ...

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    Original price $149.95 - Original price $149.95
    Original price
    $149.95
    $149.95 - $149.95
    Current price $149.95
  • Original price $394.00 - Original price $394.00
    Original price
    $394.00
    $394.00 - $394.00
    Current price $394.00

    TeleVue 2" Everbrite Star Diagonal Package With 2" To 1.25" Adapter

    TeleVue
    In Stock

    This 90° 2” mirror-type star diagonal has Everbrite dielectric mirror coatings for 99% reflectivity. In addition to higher reflectivity than a conv...

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    Original price $394.00 - Original price $394.00
    Original price
    $394.00
    $394.00 - $394.00
    Current price $394.00
  • Original price $179.95 - Original price $179.95
    Original price
    $179.95
    $179.95 - $179.95
    Current price $179.95

    Celestron 2" Starbright XLT Enhanced Aluminum Mirror Diagonal for SCTs

    Celestron
    In Stock

    This Celestron 2" mirror star diagonal for catadioptric telescopes has Starbright XLT enhanced aluminum multicoatings for a reflectivity of better ...

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    Original price $179.95 - Original price $179.95
    Original price
    $179.95
    $179.95 - $179.95
    Current price $179.95
  • Original price $43.95 - Original price $43.95
    Original price
    $43.95
    $43.95 - $43.95
    Current price $43.95

    Celestron 1.25" Prism Diagonal

    Celestron
    More on the way

    A Star Diagonal lets you view objects that are at a 90° angle from the direction the telescope is pointing, thereby allowing comfortable viewing wh...

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    Original price $43.95 - Original price $43.95
    Original price
    $43.95
    $43.95 - $43.95
    Current price $43.95
  • Original price $285.00 - Original price $285.00
    Original price
    $285.00
    $285.00 - $285.00
    Current price $285.00

    TeleVue 1.25" Everbrite 99% Reflectivity Mirror Diagonal

    TeleVue
    In Stock

    This 90° 1.25" mirror-type star diagonal has Everbrite dielectric mirror coatings for 99% reflectivity. In addition to higher reflectivity than a c...

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    Original price $285.00 - Original price $285.00
    Original price
    $285.00
    $285.00 - $285.00
    Current price $285.00
  • Original price $189.00 - Original price $189.00
    Original price
    $189.00
    $189.00 - $189.00
    Current price $189.00

    TeleVue 1.25" Enhanced Aluminum 96% Reflectivity Mirror Diagonal

    TeleVue
    In Stock

    This 90° 1.25" mirror-type star diagonal uses enhanced aluminum mirror coatings for a full 95% reflectivity. The mirror is overcoated with quartz f...

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    Original price $189.00 - Original price $189.00
    Original price
    $189.00
    $189.00 - $189.00
    Current price $189.00
  • Original price $409.00 - Original price $409.00
    Original price
    $409.00
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    Current price $409.00

    TeleVue Schmidt Cassegrain 2" Everbrite Diagonal Rich Field Kit

    TeleVue
    In Stock

    This kit is designed to allow a premium Tele Vue 2" Everbrite diagonal attach to your SCT. This 90° 2” mirror-type star diagonal has Everbrite diel...

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    Original price $409.00 - Original price $409.00
    Original price
    $409.00
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    Current price $409.00
  • Original price $305.00 - Original price $305.00
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    $305.00
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    Current price $305.00

    TeleVue 2" Mirror Diagonal With 96% Reflectivity Enhanced Aluminum Coatings And 2" To 1.25" Eyepiece Adapter

    TeleVue
    In Stock

    This 90° 2” mirror-type star diagonal has enhanced aluminum mirror coatings for 96% reflectivity. The mirror is overcoated with quartz for long lif...

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    Original price $305.00 - Original price $305.00
    Original price
    $305.00
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    Current price $305.00
  • Original price $640.00 - Original price $640.00
    Original price
    $640.00
    $640.00 - $640.00
    Current price $640.00

    Takahashi 4 Turret 1.25" Eyepiece Holder

    Takahashi
    More on the way

    Looking for a quick way to change magnifications and not use a zoom eyepiece?  This great accessory from Takahashi might be the ticket.A night of o...

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    Original price $640.00 - Original price $640.00
    Original price
    $640.00
    $640.00 - $640.00
    Current price $640.00
  • Original price $249.95 - Original price $249.95
    Original price
    $249.95
    $249.95 - $249.95
    Current price $249.95

    Celestron 2" Dielectric Star Diagonal With Twist-Lock

    Celestron
    In Stock

    Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings Ensure maximum li...

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    Original price $249.95 - Original price $249.95
    Original price
    $249.95
    $249.95 - $249.95
    Current price $249.95
  • Original price $925.00 - Original price $925.00
    Original price
    $925.00
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    Current price $925.00

    Questar 2" Quartz Silver Mirror for 7" Questars

    Questar
    More on the way

    This 2" Questar star diagonal allows the use of 2" eyepieces with the 7" Questar Maksutov. Its 1/20th wave first surface quartz mirror has silver m...

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    Original price $925.00 - Original price $925.00
    Original price
    $925.00
    $925.00 - $925.00
    Current price $925.00
  • Original price $650.00 - Original price $650.00
    Original price
    $650.00
    $650.00 - $650.00
    Current price $650.00

    Takahashi 1/10Th Wave Accuracy 2" Compression Ring Diagonal w/ 1.25" Adapter

    Takahashi
    More on the way

    This 2" diagonal uses a telescope-grade elliptical mirror with a guaranteed 1/10th wave surface accuracy for superb high contrast/high detail lunar...

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    Original price $650.00 - Original price $650.00
    Original price
    $650.00
    $650.00 - $650.00
    Current price $650.00
  • Original price $322.00 - Original price $322.00
    Original price
    $322.00
    $322.00 - $322.00
    Current price $322.00

    TeleVue 1.25" 99 Percent Reflectivity Everbite Mirror, 60 Degree Viewing

    TeleVue
    More on the way

    This unique 60° viewing angle 1.25" diagonal allows more comfortable extended viewing of objects near the ecliptic (the Moon and planets, among oth...

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    Original price $322.00 - Original price $322.00
    Original price
    $322.00
    $322.00 - $322.00
    Current price $322.00
  • Original price $395.00 - Original price $395.00
    Original price
    $395.00
    $395.00 - $395.00
    Current price $395.00

    Questar 1.25" Mirror Diagonal for Brandon Eyepieces on a 3.5" Questar

    Questar
    More on the way

    The Questar #19107 is a mirror-type 90° viewing angle star diagonal for axial viewing with a 3.5" Questar telescope. It connects to the Cassegrain ...

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    Original price $395.00 - Original price $395.00
    Original price
    $395.00
    $395.00 - $395.00
    Current price $395.00
  • Original price $170.00 - Original price $170.00
    Original price
    $170.00
    $170.00 - $170.00
    Current price $170.00

    Takahashi 1.25” Prism Diagonal

    Takahashi
    More on the way

    This premium 1.25" Takahashi TAKSD1 compression ring prism star diagonal is the diagonal that Takahashi puts with all of their complete telescope s...

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    Original price $170.00 - Original price $170.00
    Original price
    $170.00
    $170.00 - $170.00
    Current price $170.00

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