Celestron 94112-A Erect Image Diagonal Prism for Refractor and Schmidt Cassegrain Telescopes, Black

This image prism works with 1.25 eyepieces and provides a erect image (correct side up and correct right/left). Well made by Celestron and very useful when viewing the moon and planets where orientation can be an issue especially with showing views to younger people.

I wanted to look at terrestrial objects and got tired of inverted and reversed images.The fit an finish are consistent and the optic itself is suitable for looking at distant objects on the ground.The 45 degree angle is a lot more comfortable than the 90 degree for ground objects.I'm currently using it to observe Space X operations in Texas up to a mile away. I can see individual rivets and tiles on the Starship.This has expanded the utility of my Celestron NexStar 127SLT.Well worth the money.

This is the second 45° diagonal I've ordered and I ordered this Celestron because it had special coatings on it, the other one I bought (neewer) does the same thing they both have lens flare problems at night. But these are designed to be used for terrestrial viewing during the day so you don't have that problem, i also tried it on the moon and it worked fine in my C8. But it has no brass sleeve just the the locking screw which will scratch the eyepiece barrel if you're not careful.

I got this to use with a Astronomy Technology 66mm aperture refractor for terrestrial viewing. The first I sent back as the hole for the tightening screw was too big so it could not be secured in place on my scope. The replacement is fine. There are better optics out there but this item is fine for the price.

The media could not be loaded. I'm quite satisfied with this 45° Erect Image Prism for Refractors.The whole item is made of metal.The thumbscrew is quite large and easy for tightening or loosening.The end to go into the focuser has internal threading 13/16" that's more than 3/4" of threads all the way, more than enough to attach filters etc.The silver end which goes into the focuser as shown in advertised picture can be unscrewed from the 45° diagonal.The image is seen UPRIGHT, LEFT is LEFT and RIGHT is RIGHT as if you're looking through a binoculars.It came with caps on both ends to protect from dust.NOTE: One thing I noticed, on the advertising of this item, it did not say it was a 45° diagonal prism even in the description.It's only when it arrived at my home I saw the box labeled "45° ERECTING PRISM"NOTE: For those who think this is a 90° diagonal prism it's not so, it's a 45° diagonal prism so be aware.NOTE: This is a Prism diagonal and not a Mirror diagonal. From what I've read, the Prism is better than the Mirror. Only the Die Electric Mirror diagonals are the best but expensive.

I purchased this to expand the capability of my 80mm Orion Short-Tube Refractor. It's currently mounted on top of my Meade 10" LX200R as a guide scope. This diagonal allows me to use it as an intermediary finder scope between my 9x50 and my main OTA.The quality is find for what I use it for, although I wish there was a ring-style clamp inside for holding in the eyepiece. Instead it uses just the tip of the retention screw. It's the same as most inexpensive scopes & diagonals, so if you have nice eyepieces beware: it'll leave marks on them.

Although it is listed as being compatible with the Celestron 114 AZ SR telescope.it is not. It increases the required focal length so much that the telescope cannot be focused.

Perfect for looking at distant landscapes, or wildlife, across the land or over the ocean.