Skip to content
All-Star Telescope is your source for all things astro from telescopes to astrophotography cameras. Have a question? We'd love to help. Email: info@all-startelescope.com Call Us: (587) 336-6621 Toll Free: 1 (866) 310-8844
Have a question? We'd love to help. Email: info@all-startelescope.com Call Us: (587) 336-6621 Toll Free: 1 (866) 310-8844

Telescope Diagonals

Diagonals are the pieces at the back of your telescope that make it easy to look through the eyepiece.  We have a few upgrade options with high quality, high transmission dielectric mirrors and twist lock or compression ring systems for securing your valuable telescope eyepieces.  We also have erect image options that will make it easier to use your telescope for terrestrial viewing.

Read More

  • Antares 2" Diagonal, Mirror, Dielectric Machined, Twist-Lock (2MD-DTL)
    Original price $149.95 - Original price $149.95
    Original price
    $149.95
    $149.95 - $149.95
    Current price $149.95

    Antares 2" Diagonal, Mirror, Dielectric Machined, Twist-Lock (2MD-DTL)

    Sky Instruments

      2" Mirror Diagonal with Twist-lock retainer and multilayer dielectric coating with 99% reflectivity in green (546nM) light. Reduces or eliminates...

    View full details
    Original price $149.95 - Original price $149.95
    Original price
    $149.95
    $149.95 - $149.95
    Current price $149.95
  • Celestron Dielectric Star Diagonal 2" Twist-Lock (93573)
    Celestron Dielectric Star Diagonal 2" Twist-Lock (93573)
    Original price $325.95 - Original price $325.95
    Original price
    $325.95
    $325.95 - $325.95
    Current price $325.95

    Celestron Dielectric Star Diagonal 2" Twist-Lock (93573)

    Celestron

    Ensure maximum light transmission without loss of optical quality with the Celestron Dielectric Star Diagonal, 2” with Twist-Lock. Upgrade your exi...

    View full details
    Original price $325.95 - Original price $325.95
    Original price
    $325.95
    $325.95 - $325.95
    Current price $325.95
  • Antares Verascope Finder (VS60F)
    Original price $99.95 - Original price $99.95
    Original price
    $99.95
    $99.95 - $99.95
    Current price $99.95

    Antares Verascope Finder (VS60F)

    Sky Instruments

    Description VS60F is a 1.25" right angle correct imaging package with EID90 prism and W25-X eyepiece for using VS60 as a finderscope. Magnification...

    View full details
    Original price $99.95 - Original price $99.95
    Original price
    $99.95
    $99.95 - $99.95
    Current price $99.95
  • Tele Vue 2" 90 Diagonal Everbrite Satin (DDP-8004)
    Original price $512.00 - Original price $512.00
    Original price
    $512.00
    $512.00 - $512.00
    Current price $512.00

    Tele Vue 2" 90 Diagonal Everbrite Satin (DDP-8004)

    Tele Vue Optics

    Whiter and brighter images. Simply put, that is the benefit the Everbrite mirror coating. This exotic, dielectric, nonmetallic coating is 99% refle...

    View full details
    Original price $512.00 - Original price $512.00
    Original price
    $512.00
    $512.00 - $512.00
    Current price $512.00
  • Celestron 45-Degree Erect Image Diagonal 1.25" (94112-A)
    Celestron 45-Degree Erect Image Diagonal 1.25" (94112-A)
    Sold out
    Original price $68.95 - Original price $68.95
    Original price
    $68.95
    $68.95 - $68.95
    Current price $68.95

    Celestron 45-Degree Erect Image Diagonal 1.25" (94112-A)

    Celestron

    Did you know that most telescopes work well for daytime viewing as well as for astronomy? If you have a refractor or a catadioptric telescope (the ...

    View full details
    Original price $68.95 - Original price $68.95
    Original price
    $68.95
    $68.95 - $68.95
    Current price $68.95
    Sold out
  • Tele Vue 1.25" 90 Diagonal Everbrite Satin (DPC-1250)
    Sold out
    Original price $512.00 - Original price $512.00
    Original price
    $512.00
    $512.00 - $512.00
    Current price $512.00

    Tele Vue 1.25" 90 Diagonal Everbrite Satin (DPC-1250)

    Tele Vue Optics

    Whiter and brighter images. Simply put, that is the benefit the Everbrite mirror coating. This exotic, dielectric, nonmetallic coating is 99% refle...

    View full details
    Original price $512.00 - Original price $512.00
    Original price
    $512.00
    $512.00 - $512.00
    Current price $512.00
    Sold out
  • Celestron 1.25" Star Diagonal (94115-A)
    Celestron 1.25" Star Diagonal (94115-A)
    Original price $68.95 - Original price $68.95
    Original price
    $68.95
    $68.95 - $68.95
    Current price $68.95

    Celestron 1.25" Star Diagonal (94115-A)

    Celestron

    The Celestron 1.25” Star Diagonal slides into the focuser (1.25”) of your refractor or catadioptric telescope and accepts standard 1.25” eyepieces,...

    View full details
    Original price $68.95 - Original price $68.95
    Original price
    $68.95
    $68.95 - $68.95
    Current price $68.95
  • Celestron Dielectric Star Diagonal 1.25" With Twist-Lock (93571)
    Celestron Dielectric Star Diagonal 1.25" With Twist-Lock (93571)
    Original price $201.95 - Original price $201.95
    Original price
    $201.95
    $201.95 - $201.95
    Current price $201.95

    Celestron Dielectric Star Diagonal 1.25" With Twist-Lock (93571)

    Celestron

    Ensure maximum light transmission without loss of optical quality with the Celestron Dielectric Star Diagonal, 1.25” with Twist-Lock. Upgrade your ...

    View full details
    Original price $201.95 - Original price $201.95
    Original price
    $201.95
    $201.95 - $201.95
    Current price $201.95
  • Antares Dielectric 1.25" Diagonal (MSD-DTL)
    Original price $119.95 - Original price $119.95
    Original price
    $119.95
    $119.95 - $119.95
    Current price $119.95

    Antares Dielectric 1.25" Diagonal (MSD-DTL)

    Sky Instruments

    Premium dielectric coatings in a carbon fibre body and twist lock adapter to prevent marring of eyepieces.  

    Original price $119.95 - Original price $119.95
    Original price
    $119.95
    $119.95 - $119.95
    Current price $119.95
  • Antares 45 Degree 2" Prism Diagonal (2EID45)
    Original price $144.95 - Original price $144.95
    Original price
    $144.95
    $144.95 - $144.95
    Current price $144.95

    Antares 45 Degree 2" Prism Diagonal (2EID45)

    Sky Instruments

     A 45 degree 2" precision polished correct image amici prism that allows for terrestrial viewing with 2" eyepieces. MgF2 coated, It is also suitabl...

    View full details
    Original price $144.95 - Original price $144.95
    Original price
    $144.95
    $144.95 - $144.95
    Current price $144.95