About this item
- Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings
- Provides a 90° viewing angle, perfect for more comfortable viewing through refractor and cass grain-type telescopes
- 58 layers of dielectric coatings provide an over 99% reflective surface, ensuring the maximum amount of light collected by the telescope reaches the eyepiece
- Twist-lock keeps the eyepiece centered in the diagonal to provide better optical alignment
- Includes a Stepdown adapter, so the diagonal accepts eyepieces, Barlow lenses, threaded filters, and other accessories in both 2” and 1. 25” sizes
– Walker Heller
I do not have an expensive telescope (a 5″ Maksutov) but the telescope glass is pretty good. The problem is the 5″ aperture which only allows so much light to come in. This means the optics attached to the telescope need to be as high quality as you can afford so you can get all the light possible to the eyepiece. For this I purchased Celestron’s dielectric star diagonal because it is much better than the original cheap diaganol. It is easy to work with, too, because of the special twist lock it has which lets me change eyepieces easily and safely. I’m surprised more amateur astronomers don’t start with buying a better diagonal like this one. When I upgrade my telescope the Celestron Star Diaganol can work with the new scope too.
– Mr. Lonzo Hoppe
The “Celestron Dielectric Star Diagonal 2″ with Twist Lock” I just received I installed on my Celestron Nexstar 8SE. I have been using the 1.25 Diagonal and I am very impressed with the improvement. This is worth the investment.
– Shannon Kohler
Optics seem excellent. I also love the locking style 2 inch and 1.25 adapter. One thing I think could be improved is that when screwing it on to the back of the OTA there is a very fine line between having it loose so that the diagonal is not secure and having it so tight that it is very hard to get off. This purchase actually caused me to go buy a set of strap wrenches for this issue. Of course the strap wrenches work fine but it is still a bit odd to me how easy it is to over or under tighten.
– Miss Leanne Dooley V
Changed from 1.25 to 2″ diagonal. The twist locks make changing eyepieces a breeze.This is an excellent eyepiece, and compared to buying separately, a very good deal!
– Kyra Abbott
Love the jump from the stock 1.25″ diagonal to this monster! Even better when adding 2″ eyepieces, but so cool that I can use my 1.25″ EPs as well. Love the twist lock feature. Makes it very simple to swap EPs, and they are held confidently in place. Totally worth it!
– Burley Oberbrunner
I use this with my 1999 Celestron Celestar C8 SCT. Nice upgrade much brighter views. Also Using with the Celestron f6.3 focal reducer, 2” eyepieces ok on focus, only my 40mm 1.25” eyepiece would come into focus, any 1.25” eyepieces below 40mm would not focus. I bought a William Optics SCT Adapter for Standard 2 Diagonal – Gold – D-SCT-TA that is shorter than the one this 2” diagonal came with to shorten the light path. Now all my 1.25” eyepieces come into focus range. Celestron should have tested this more, and included a shorter front. Before release.
– Kayleigh Hegmann
This thing is beautifully made. I hate buying stuff made in China but you can’t argue that they aren’t making a very good optical product. 5 stares for QC.