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Celestron 45-Degree Erect Diagonal (1.25")

B&H # CEDEI451.25 Mfr # 94112-A
In Stock
Free Expedited Shipping on Orders over $49
You Pay: $26.89
Product Highlights
  • Upright & Laterally-Correct Observing

Celestron's erect image diagonals are Amici prism designs, allowing you to look into the telescope at a 45° angle at images which are upright and laterally correct.  This is extremely comfortable for terrestrial viewing or when sharing the viewing experience between those of varying heights, and comes at the expense of a loss in brightness versus a 90° diagonal-which would show images upright but laterally reversed.

Accepts 1.25" filters for astronomical and terrestrial applications
Weighs 0.24 lb (110 g)
Celestron 45-Degree Erect Diagonal (1.25")
  • 1-Year Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    Celestron45-Degree Erect Diagonal (1.25")
     
    4.4

    (based on 5 reviews)

    Ratings Distribution

    • 5 Stars

       

      (3)

    • 4 Stars

       

      (1)

    • 3 Stars

       

      (1)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Easy to use (3)

    Cons

      Best Uses

          • Reviewer Profile:
          • Casual/ recreational (4)
          • Was this a gift?:
          • No (4)

        Reviewed by 5 customers

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        Displaying reviews 1-5

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        4.0

        Double the use of the telescope

        By Rafael

        from Bogotá, Colombia

        About Me Professional Guide

        Verified Buyer

        Pros

        • Compact
        • Easy to Use
        • Strong Construction

        Cons

          Best Uses

          • Astronomy
          • Bird Watching
          • Bright Conditions
          • Hiking/Backpacking

          Comments about Celestron 45-Degree Erect Diagonal (1.25"):

          With this accessory I use the telescope during daytime hours. Good accessory, economical and useful. Increases productivity of the telescope.

          • Was this a gift?:
          • Yes

          Share this review

           
          5.0

          It worked!

          By Luis

          from Mexico

          About Me Casual/ Recreational

          Verified Buyer

          Pros

          • Easy to Use

          Cons

            Best Uses

            • Astronomy

            Comments about Celestron 45-Degree Erect Diagonal (1.25"):

            During long time I was using my Celestron seeing things upside down! Now I am able to see things as they are.
            Thank you for the advise and orientation

            • Was this a gift?:
            • No

            Share this review

             
            3.0

            Cheap & useful but not perfect

            By PeterA

            from Brisbane, Australia

            About Me Casual/ Recreational

            Verified Buyer

            Pros

            • Easy to Use
            • Lightweight

            Cons

            • Cheaply Made
            • Uncertain quality

            Best Uses

            • Bird Watching
            • Hiking/Backpacking
            • Hunting
            • Travel

            Comments about Celestron 45-Degree Erect Diagonal (1.25"):

            Would be great for terrestrial viewing and the low price attracted me, but...
            The main item of note is that the undersized prism has a clear aperture 18mm in diameter compared with 28mm for the standard 1.25" 90 degree model supplied with Celestron SCT's. Also,contrary to the illustration it has only one screw to affix the eyepiece and no grubb screw in the side to adjust the prism. The point of focus is quite different than when using the standard 90 degree prism.

            This 18mm diameter prism means that when using low magnification eyepieces you suffer vignetting around the edges. For example the field lens of the 40mm Plossl that came with my C11 uses the full inside diameter of the barrel of 28.5mm and vignetting is bad, and the edge of the field is not visible. A standard 25mm plossl has a 23mm wide lens and vignetting is very apparent. It is not until you get to the 8-24mm Celestron zoom with a small field lens of 16mm (narrow low power field) or higher powers like a 12.5mm plossl (11mm wide lens) that vignetting is not apparent.

            So this effectively rules out low power wider angle views. Examining the image critically I formed the view that the vignetting encroached a tad more at the lower edge of the field. The images also appear to vary very slightly in focus and quality over the field, but not on one axis as you might expect if it was an alignment issue.

            I felt that the image was not quite as bright nor quite as sharp as with the 90 degree model, but it was a very close call. I was trying to be as critical as I could, switching from one diagonal to the other using the same eyepieces. I believe, that the differences were subtle, but apparent. I used Jupiter and the galilean satellites on my C11 for my comparison and they are always a good test.

            • Was this a gift?:
            • No

            Share this review

             
            5.0

            This product is more best with another.

            By Jose l.

            from Fajardo,P.R.

            About Me Casual/ Recreational

            Verified Buyer

            Pros

            • Great picture quality

            Cons

            • Heavy

            Best Uses

              Comments about Celestron 45-Degree Erect Diagonal (1.25"):

              I use this product constantly for entertaiment.
              A good caracteris is the clarity and good angle for view.
              Nothing, is very great.

              • Was this a gift?:
              • No

              Share this review

              (1 of 1 customers found this review helpful)

               
              5.0

              I would recommend this product

              By PhotoJoe

              from Coconut Creek,Fl

              About Me Casual/ Recreational

              Verified Reviewer

              Pros

              • Compact
              • Quality Lenses
              • Strong Construction

              Cons

                Best Uses

                  Comments about Celestron 45-Degree Erect Diagonal (1.25"):

                  I like this product because it does what it says. Lets you see the images in a correct horizontal and lateral views. One thing that is very important is that you have to make sure you have a Barlow lens to do your viewing. Very easy to set up and use.

                  • Was this a gift?:
                  • No

                  Share this review

                  Cleaning & Anti-Fog

                  Giottos -  Rocket Blaster Dust-Removal Tool (Medium, Black)
                  • You Pay: $8.85
                   
                  Celestron -  Ultra High Contrast Light Pollution Reduction Filter (1.25")
                  • You Pay: $54.95
                   

                  Eyepiece Adapters

                  Tele Vue -  2" to 1.25" Adapter - Allows Using 1.25" Devices in 2" Focusers
                  • You Pay: $56.89
                   
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