



See Options
1 Year
$16.99
2 Year
$29.99
3 Year
$39.99
Need help? Ask our experts.
Review Summary
2021-10-20T09:17:54
This is a beautifully engineered luxury item. It yields great views through my Celestron NexStar 8SE when compared to the 1.25 inch diagonal that came with the scope. It also comes with the adapter to allow the use of 1.25 inch eyepieces. That adapter is securely held in place by a screw. Adorama got this item to me in only 4 days which was fantastic as many of the accessories I normally buy come from Chinese sellers and take several weeks in most instances.
Allen R.
2020-10-27T09:28:59
So much better than the standard diagonal that ships with the Celestron Nexstar 8se and allows for 2" eye pieces as another plus!
Richard P.
2019-03-19T10:12:29
I bought this based on recommendations I read online. Adorama had the best price at the time so I bought it from Adorama. Great diagonal. I have also bought eyepieces from Adorama. I have always received great service and great products from Adorama. I am pretty positive I will be checking their website regularly to see if there are any other things I can't live without.
Larry T.
2018-11-13T08:01:34
The Celesrton 90 degree diagonal is well built with a great finish. The mirror is very flat and very reflective. Great diagonal at a nice price.
Edward H.
2018-06-06T16:19:58
Fit, function, and clarity was perfect very happy with this. And the price was great also.
Eugene C.
2016-12-14T12:37:40
I really like my celestron star diagnal. It is very well made and threatened on to my c8 perfectly. The XLT coating is very reflective. I have purchased several of these in the past and all were very well made.Aborama shipping is very fast I would recommend this product to anyone
martin H.
2009-02-05T19:00:00
Seems to work as advertised - but this is my first 2" diagnal, so I don't have a lot to compare.
Stargazer
2009-01-21T19:00:00
Excellent diagonal for an SCT scope. Connects directly to rear cell using SCT threads. Eyepiece side comes with 2" - 1.25" adapter. Both sizes have compression ring clamps. Glad I bought it for my Nexstar 6SE.
Arctic E.
Accidents happen. Protect your favorite Adorama products and purchase a protection plan to stay covered from accidental damage, mechanical or electrical failures, and more.
If we can’t fix it, we’ll replace it at no additional cost.
Protect your product from drops, spills, and more.
Enjoy your gear without fear. We have you covered!
When regular use of your product over time results in mechanical or electrical failure.
We will never charge you a deductible after the purchase of a plan.
Our claims process is simple & easy and our customer service team is happy to help.
Adorama Protect powered by Extend is available for purchase to customers in the United States. Not available for international or U.S. territories purchases. Plans on open box items do not cover pre-existing damage.
Adorama Protect plans are available for ABS clients. If you have any questions or require assistanse, please call 800-223-2500
Browse our FAQ
Celestron 90d 2" diagonal mirror
By Arctic E.
Excellent diagonal for an SCT scope. Connects directly to rear cell using SCT threads. Eyepiece side comes with 2" - 1.25" adapter. Both sizes have compression ring clamps. Glad I bought it for my Nexstar 6SE.
Great upgrade that is well worth the money.
By Allen R.
This is a beautifully engineered luxury item. It yields great views through my Celestron NexStar 8SE when compared to the 1.25 inch diagonal that came with the scope. It also comes with the adapter to allow the use of 1.25 inch eyepieces. That adapter is securely held in place by a screw. Adorama got this item to me in only 4 days which was fantastic as many of the accessories I normally buy come from Chinese sellers and take several weeks in most instances.
Are you in search of a durable and high-quality diagonal mirror for your Schmidt-Cassegrain telescope Look no further than the 90-degree Angle Diagonal Mirror, 2" with XLT Coating. This superior optical accessory, crafted by the reputable brand Celestron, is designed to enhance your stargazing experience.
This versatile mirror diagonal is engineered with multi-coated optics, featuring Celestron's premier StarBright XLT coatings. These advanced coatings ensure maximum light transmission, delivering crisp, clear, and bright images, even in low-light conditions.
What sets this product apart is its interferometer-tested 10th wave flat mirror. This feature guarantees precision and accuracy in your observations, making it an ideal choice for serious astronomers and hobbyists alike.
The 2" eyepiece compatibility of this diagonal mirror offers a wider field of view, allowing you to explore the cosmos in greater detail. Whether you're tracking a comet across the night sky or observing the rings of Saturn, this reliable diagonal mirror will not disappoint.
Moreover, this sturdy and reliable diagonal mirror comes with a robust aluminum carrying case. This case provides optimal protection for your optical equipment during travel or storage, ensuring its longevity.
In summary, the 90-degree Angle Diagonal Mirror, 2" with XLT Coating for Schmidt-Cassegrain Telescopes is a testament to Celestron's commitment to quality and innovation. Its high customer rating of 5.0 out of 8 reviews further attests to its performance and customer satisfaction. Enhance your celestial observations with this top-tier optical accessory.
https://www.celestron.com/pages/warranty
310-328-9560