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Celestron 45-Degree Erect Diagonal (1.25")

B&H # CEDEI451.25 MFR # 94112-A
Celestron 45-Degree Erect Diagonal (1.25")

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Product Highlights

  • Upright & Laterally-Correct Observing

You Pay: $27.48

Questions? Ask our experts:

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)
UPC: 050234941129
Packaging Info
Package Weight 0.3 lb
Box Dimensions (LxWxH) 4.5 x 3.1 x 2.0"
Celestron 45-Degree Erect Diagonal (1.25")
  • 1-Year Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    Celestron45-Degree Erect Diagonal (1.25")
     
    4.3

    (based on 7 reviews)

    Ratings Distribution

    • 5 Stars

       

      (3)

    • 4 Stars

       

      (3)

    • 3 Stars

       

      (1)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Easy to use (5)
    • Compact (3)
    • Strong construction (3)

    Cons

    No Cons

    Best Uses

    • Bird watching (3)
    • Hiking (3)
      • Reviewer Profile:
      • Casual/ recreational (5)
      • Was this a gift?:
      • No (5)

    Reviewed by 7 customers

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    Displaying reviews 1-7

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    4.0

    Very useful but watch usable field

    By Peter

    from Brisbane, Australia

    About Me Casual/ Recreational

    Verified Reviewer

    Pros

    • Accurate
    • Compact
    • Easy to Use

    Cons

      Best Uses

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

        I purchased such a unit a couple of years ago. It is fantastic for SCT's to produce an upright left to right correct image but be aware that you will experience vignetting or falloff of image brightness at the edges of wider angle eyepieces.

        From my quick measurements, while the brightness is much the same, in a standard 1.25 inch right angle diagonal prism the unobstructed light path has a diameter of 28mm. In this unit it is 18mm, no doubt because of the different prism involved and this resticts the light transmitted to around 41% of the area. It is just a fact of life and if you are aware of it, you can adjust accordingly when considering which eyepiece to use.

        Also instead of two grubb screws set at 90 degree offset to hold the eyepiece, my 45 degree unit,has just the one, though the present illustration tends to indicate two.

        • Was this a gift?:
        • No

        Share this review

         
        4.0

        Best for daytime viewing

        By Paul Gates

        from Hattiesburg, MS

        About Me Avid Adventurer

        Verified Buyer

        Pros

        • Accurate
        • Easy to Use
        • Lightweight
        • Strong Construction

        Cons

          Best Uses

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

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

          I purchased this diagonal as an alternative to my 90 degree star diagonal. It's great for daytime viewing, but I feel like objects are much dimmer at night time with it compared to my 90 degree diagonal.

          Share this review

           
          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

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