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Celestron 90-Degree Mirror Diagonal (2") for SCT Scopes

B&H # CEDM2S MFR # 93527
In Stock
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Product Highlights

  • Upright, Laterally-Reversed Images
  • Fits Catadioptric 2"-18 Rear Threads
  • Starbright XLT Coatings

You Pay: $105.95

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The Celestron 90-Degree Mirror Diagonal (2") is a star diagonal with StarBright XLT coating, for use with Schmidt-Cassegrain telescopes with the 2"-18 threaded device.

Star diagonal is the term commonly associated with 90° mirror diagonals such as this, which let you view objects that are at a 90° angle from the direction the telescope is pointing.  This allows quite comfortable viewing when the telescope is at or near the zenith (directly overhead), and is fairly comfortable when observing terrestrial imagery as well-albeit a bit unorthodox at first.

Celestron's erect image diagonals are Amici prism designs, meaning that images are upright and laterally correct.  This design, however, instead renders images which are laterally reversed but are brighter than erect image diagonals.  This diagonal is used with 2" focusers and can be used with either 2.00" or 1.25" eyepieces, thanks to the included adapter which reduces the eyepiece barrel diameter to accept the smaller size.  

StarBright XLT coating system offers multi-layer enhanced mirror coatings, which shift the peak reflectance to the center of the visible spectrum. The coating process uses state-of-the-art thin film vacuum deposition technology. To ensure consistent optical coatings of the highest quality the process is tightly monitored and controlled by highly trained coating technicians.
Improved attachment design features a brass clamping ring which does not mar, and provides a more secure connection.
Accepts 2" filters for astronomical applications.
Weight Body: 0.88 lb (400g)
Eyepiece Adapter: 0.19 lb (85g)
Celestron 90-Degree Mirror Diagonal (2") for SCT Scopes
  • 2" to 1.25" Eyepiece Barrel Diameter Reducer
  • Padded Aluminum Case
  • Dust Caps
  • 1-Year Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    Celestron90-Degree Mirror Diagonal (2") for SCT Scopes
     
    5.0

    (based on 3 reviews)

    Ratings Distribution

    • 5 Stars

       

      (3)

    • 4 Stars

       

      (0)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Great optics (3)
    • Strong construction (3)

    Cons

      Best Uses

      • Astronomy (3)
        • Reviewer Profile:
        • Casual/ recreational (3)

      Reviewed by 3 customers

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      Displaying reviews 1-3

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      5.0

      Great Upgrade

      By Dobie15

      from Apison, TN

      About Me Casual/ Recreational

      Verified Buyer

      Pros

      • Great Optics
      • Strong Construction

      Cons

        Best Uses

        • Astronomy

        Comments about Celestron 90-Degree Mirror Diagonal (2") for SCT Scopes:

        Best upgrade to my scope so far.

        • Was this a gift?:
        • No

        Share this review

         
        5.0

        Well made accessory.

        By Brian

        from Niagara, Ontario, Canada

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Easy To Use
        • Good Padding
        • Great Optics
        • Strong Construction
        • Widely Compatible Adapter

        Cons

          Best Uses

          • Astronomy

          Comments about Celestron 90-Degree Mirror Diagonal (2") for SCT Scopes:

          This is a well-constructed accessory, which will let you use larger 2" eyepieces. It also comes with a 1.25" adapter for the smaller eyepieces. It comes in an aluminum, foam-lined case as well.

          One minor comment: Be aware that you may not be able to use your finder scope after you install this huge diagonal! I need to replace my finder scope on my C6-SGT telescope with an angled 90-degree one.

          • Was this a gift?:
          • No

          Share this review

           
          5.0

          Outstanding Product

          By Phillymanjaro

          from Glendale AZ

          About Me Casual/ Recreational

          Verified Buyer

          Pros

          • Easy To Use
          • Good Padding
          • Great Optics
          • Really solid
          • Strong Construction
          • Widely Compatible Adapter

          Cons

            Best Uses

            • Astronomy
            • Astrophotography

            Comments about Celestron 90-Degree Mirror Diagonal (2") for SCT Scopes:

            This product alowed me to have a greater field of view but more importantly made my camera and lense solid as a rock to the scope

            Share this review

            Cleaning & Anti-Fog

            See more
            Giottos - Rocket Blaster Dust-Removal Tool (Large, Black)
            • You Pay: $9.75
             

            Filters

            See more
            Celestron - Oxygen III (OIII) Narrowband 48mm Filter (Fits 2" Eyepieces)
            • You Pay: $77.95
             
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