Celestron 93573 Dielectric Star Diagonal 2" with Twist Lock

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!

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.

I have the Celestron Evolution 8 telescope. It came with the 1.25" diagonal and it worked. I had been reading that the 2" would increase the viewing area (along with a 2" eyepiece) so I decided to take a gamble and I'm glad I did. Not only did it increase the viewing area, it made the images sharper. Again, don't know if it is the diagonal or the 2" Luminos eyepiece (31mm) but I am very happy with this upgrade.

Nice diagonal for $200, especially if you own a SCT. The only issue like others have mention, is it does not have enough thread depth for the 6.3 focal reducer corrector. Others have swapped the SCT ring from the 1.25 stock visual back. This does work fine and I got 1.5 turns onto the focal reducer. The solution I prefer is to purchase the Astromania adapter. This will convert SCT threads to M42 or M48 with M48 adapter. The diagonal uses M48. The adapter does not reduce the light path diameter to the diagonal. I use the astro adapter to attach all kinds of stuff to my C8. The really nice thing is it provides two full turns to the focal reducer. This allows significant more weight bearing. One star off for not thinking about the 6.3 reducer connection ahead of time.https://www.amazon.com/gp/product/B01M5BQAC5/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Excellent item ,fast shipping.

This fit my Astro Tech AT115EDT perfectly.. I like the fact that it includes twist lock adapters for both 2” and 1.25” eyepieces. Basically it’s a complete package, with everything needed to fit a large variety of telescope.

Great quality and a nice improvement over the stock one that came with my telescope. Fit perfectly into a celestron 6se.

2" twist lock diagonal. Excellent all around. Well built, heavy duty materials, excellent fit and finish, and optically is a great performing diagonal. The twist to lock rings are nicely machined aluminum in Celestron orange which are easy to see and use in the dark. Using this on a Celestron CPC 925 HD telescope.