Celestron 45-Degree Erect Diagonal (1.25")

Celestron 45-Degree Erect Diagonal (1.25")

Celestron 45-Degree Erect Diagonal (1.25")

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

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Product Highlights

  • Upright & Laterally-Correct Observing

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Celestron 94112-A overview

  • 1Description

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
In the Box
Celestron 45-Degree Erect Diagonal (1.25")
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Celestron 94112-A specs

    Packaging Info
    Package Weight 0.285 lb
    Box Dimensions (LxWxH) 4.45 x 2.85 x 2.1"

    Celestron 94112-A reviews

    45-Degree Erect Diagonal (1.25") is rated 4.5 out of 5 by 11.
    Rated 4 out of 5 by from Very useful but watch usable field 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.
    Date published: 2015-04-14
    Rated 5 out of 5 by from I would recommend this product 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.
    Date published: 2010-10-10
    Rated 3 out of 5 by from Cheap & useful but not perfect 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.
    Date published: 2011-11-20
    Rated 4 out of 5 by from Best for daytime viewing 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.
    Date published: 2015-03-23
    Rated 4 out of 5 by from I would buy this again I use this with my 127eq. It's great for looking at the moon in its true orientation. Minimum confusion for tracking objects since reflecting telescopes display objects upside down and backwards.
    Date published: 2017-08-17
    Rated 5 out of 5 by from It worked! 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
    Date published: 2013-04-29
    Rated 4 out of 5 by from Double the use of the telescope With this accessory I use the telescope during daytime hours. Good accessory, economical and useful. Increases productivity of the telescope.
    Date published: 2013-07-31
    Rated 5 out of 5 by from This product is more best with another. I use this product constantly for entertaiment. A good caracteris is the clarity and good angle for view. Nothing, is very great.
    Date published: 2011-05-31
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