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Diagonals

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  1. Orion 1.25" Enhanced Mirror Star Telescope Diagonal

    Orion - 1.25" Enhanced Mirror Star Telescope Diagonal

    Don't put a standard-issue diagonal into a high-quality refractor or Cassegrain telescope or you'll be losing 10% or more of the light collected by the telescope's optics.

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    Model#: 08879

    Available - Ships in 2-4 Days

    $69.99

  2. TeleVue - 90° Enhanced 2" Star Diagonal (Satin)*

    TeleVue - 90° Enhanced 2" Star Diagonal (Satin)*

    This is the same 2-inch Star Diagonal that comes with the Tele-Vue 85 and the Pronto. Exquisitely crafted to fold light exactly 90 degrees.

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    FREE SHIPPING
    (48 States)
    Model#: DSC-8001

    Available - Ships in 2-4 Days

    Regular Price: $225.00

    Special Price: $215.00

  3. Olivon - 2" Diagonal Erecting Prism

    Olivon - 2" Diagonal Erecting Prism

    Olivon 2" - 1.25" 90° Prism Diagonal w/BAK4 & FMC Coating

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    Model#: OL2DIAG-US

    Available - Ships in 2-4 Days

    $129.00

  4. Astro-Tech - 1.25" Dielectric Coated Star Diagonal with Compression Ring

    Astro-Tech - 1.25" Dielectric Coated Star Diagonal with Compression Ring

    This 1.25” Astro-Tech first-surface mirror star diagonal was named a Sky & Telescope Hot Product for 2007!

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    Model#: AT1D

    In Stock

    $69.95

  5. Orion - 1.25" Deluxe 45-degree Correct-Image Prism Diagonal

    Orion - 1.25" Deluxe 45-degree Correct-Image Prism Diagonal

    Turn any refractor or Cassegrain telescope into a high-performance daytime spotting scope with our Deluxe 45° Correct-Image Diagonal.   

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    Model#: ORI-08754

    Available - Ships in 2-4 Days

    $79.99

  6. Baader Planetarium Clicklock Dielectric Star Diagonal - 2"

    Baader Planetarium - Clicklock Dielectric Star Diagonal - 2"

    With their ground-breaking introduction several years ago of the all-dielectric 2" Maxbright star diagonal, Baader Planetarium brought mirror star diagonals into the 21st century.

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    FREE SHIPPING
    (48 States)
    Model#: MAX-2C

    Available - Ships in 2-4 Days

    $297.00

  7. Baader Planetarium Erecting Prism 1.25"

    Baader Planetarium - Erecting Prism 1.25"

    Erecting prism with a 45° viewing position used for terrestrial observation. They show an upright and correctly orientated image.

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    Model#: AMICI-45

    Available - Ships in 2-4 Days

    $92.00

  8. AMICI-DX1

    Baader Planetarium - Precision Amici Diagonal

    The Amici Prism has long been favored as the best choice for producing correctly oriented images in refractors and cassegrain type telescopes.

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    FREE SHIPPING
    (48 States)
    Model#: AMICI-DX1

    Available - Ships in 2-4 Days

    $299.00

  9. Explore Scientific - TDM Adapter with Encoder 16" ACF (requires 0721004 TDM Controller with Cable)

    Explore Scientific - TDM Adapter with Encoder 16" ACF (requires 0721004 TDM Controller with Cable)

    TDM Adapter with Encoder 16" ACF (requires 0721004 TDM Controller with Cable)

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    FREE SHIPPING
    (48 States)
    Model#: 0721260

    Available - Ships in 2-4 Days

    $1,599.99

  10. TDM

    Explore Scientific - TDM Telescope Drive Master Encoder Only (Requires Mount Specific Adapter)

    TDM Telescope Drive Master Encoder Only (Requires Mount Specific Adapter)

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    (48 States)
    Model#: 0721001

    Available - Ships in 2-4 Days

    $899.99

  11. Explore Scientific TDM Adapter iOptron iEQ45

    Explore Scientific -TDM Adapter iOptron iEQ45

    TDM Adapter iOptron iEQ45

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    (48 States)
    Model#: 0721045

    Available - Ships in 2-4 Days

    $469.99

  12. Explore Scientific - TDM Telescope Drive Master Ver. 2 Encoder and Electronics Set (Requires Mount Adapter)

    Explore Scientific - TDM Telescope Drive Master Ver. 2 Encoder and Electronics Set (Requires Mount Adapter)

    TDM Telescope Drive Master Ver. 2 Encoder and Electronics Set (Requires Mount Adapter) ... Learn More
    FREE SHIPPING
    (48 States)
    Model#: 721000

    Available - Ships in 2-4 Days

    $1,799.99

  13. Explore Scientific - TDM Adapter for Celestron CGE Pro

    Explore Scientific - TDM Adapter for Celestron CGE Pro

    TDM Adapter for Celestron CGE Pro ... Learn More
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    (48 States)
    Model#: 0721028

    Available - Ships in 2-4 Days

    $329.99

  14. Explore Scientific - TDM Adapter for Meade LX200ACF

    Explore Scientific - TDM Adapter for Meade LX200ACF

    TDM Adapter for MEADE LX200ACF ... Learn More
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    (48 States)
    Model#: 0721250

    Available - Ships in 2-4 Days

    $729.99

  15. Explore Scientific - TDM Adapter for Meade LX200 8"-12"

    Explore Scientific - TDM Adapter for Meade LX200 8"-12"

    TDM Adapter for MEADE LX200 8“-12“ ... Learn More
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    (48 States)
    Model#: 0721220

    Available - Ships in 2-4 Days

    $729.99

  16. Explore Scientific TDM Adapter for Astro Physics 1200 Mount

    Explore Scientific - TDM Adapter for Astro Physics 1200 Mount

    TDM Adapter for Astro Physics 1200 Mount

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    FREE SHIPPING
    (48 States)
    Model#: 0721200

    Available - Ships in 2-4 Days

    $329.99

  17. Explore Scientific - TDM Adapter for Meade LXD75

    Explore Scientific - TDM Adapter for Meade LXD75

    You need this adapter to attach the TDM to your MEADE LXD75 mount.

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    (48 States)
    Model#: 0721075

    Available - Ships in 2-4 Days

    $479.99

  18. Explore Scientific 3" Diagonal

    Explore Scientific - 3" ES Diagonal

    Diagonal for 3" Eyepieces. Will work with the Explore Scientific 30mm 100° Series eyepiece.

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    (48 States)
    Model#: DD03-01CF

    Available - Ships in 2-4 Days

    $399.99

  19. Explore Scientific - 2"  99% Reflectivity ES Diagonal

    Explore Scientific - 2" 99% Reflectivity ES Diagonal

    The Explore Scientific 2" Dielectric Diagonal is a nice light weight diagonal. The engineers at Explore Scientific were able to achieve weight savings when compared to traditional diagonals replacing some of the base material with carbon fiber material

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    Model#: DD02-00CF

    In Stock

    $119.99

  20. Olivon 2" Mirror Star Diagonal

    Olivon - 2" Mirror Star Diagonal

    Olivon 2" Mirror Star Diagonal. Fully Multi-Coated 2" 90° diagonal with 1.25" adapter included. Lightweight, all aluminum construction. Uses 99% Reflective Dielectric coatings.

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    Model#: OL2MSDIAG-US

    In Stock

    $129.00

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