1.25" 45° Erect Image Diagonal – Accessory for Telescopes | For Refractors, SCTs, & Spotting Scopes, Upright Correct-Image Viewing, Comfortable Observing Day to Night, 1.25" Compatible

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.

This fit my Celestron telescope perfectly, now I could use it for birdwatching or any other terrestrial viewing. Works great, fits great. I’m very very pleased highly recommend.

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.

Works Great. No issues.

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.

I have a Astromania 60mm Compact Deluxe Finder & Guidescope with 1.25" Double Helical Focuser - lots of focuing travel. I’ve tried every eyepiece from 5mm to 40mm and none of them will come into focus from 10m to 2000m using this prism. I suspect that the problem lies with the guidescope, but I have no way of determining the quality of the diagonal since I can’t bring it to focus.

Picked this up to replace the dodgy cheap plastic one that came with my scope, where the eyepiece retention screw had stripped out. The build quality is great. My only issue is with this eyepiece I can no longer focus in enough. I’m getting a Barlow to attempt and fix this issue, hopefully that works. Just be cautious that changing diagonals can cause focusing issues.

I love this product! It does exactly what it says. My wife purchased a good sized telescope (Nexstar 8SE) for my birthday and we’ve been learning the ins and outs of using it. I have purchased several lenses and this is by far one of the most useful. The Good: Rights the image – This is handy for determining exactly what is on TV in the neighbor’s apartment across the street, block, city (depending on your particular hardware) Also for Planets/Celestial bodies. Makes it much easier to manually move the telescope by hand or with the electronics if you have them. If you see it move up and left, you move the telescope up and left, not inverted and backwards. The Bad: None. I love reviews like this. Verdict: If you are tired of trying to invert things in your mind and staring at upside down stuff, buy this, you won’t regret it.