Name: Celestron Dielectric Star Diagonal, 2" with Twist-Lock
Brand: Celestron
SKU: CNDIM2XSD
Price: 259.95 USD
Availability: InStock
Rating: 4.8 (18 reviews)

Celestron Dielectric Star Diagonal, 2" with Twist-Lock

Celestron Dielectric Star Diagonal

Celestron

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Optics & Binoculars

Telescopes & Astronomy

Telescope Accessories

Celestron Telescope Accessories

Celestron Dielectric Star Diagonal 

Enhance your telescope with the Celestron 2" Dielectric Star Diagonal. Featuring >99% reflectivity, twist-lock, and durable build. Shop now for superior viewing!

Find the ultimate upgrade for your telescope with the Celestron Dielectric Star Diagonal, 2" with Twist-Lock. This premium star diagonal is designed to enhance your stargazing experience by delivering brighter, sharper images without the need for a new telescope. This high-quality star diagonal is engineered to reflect the telescope's light path at a 90-degree angle, offering a more comfortable viewing angle. The glass is fortified with 58 layers of dielectric coatings, ensuring an over 99% reflective surface. This superior reflectivity guarantees maximum light transmission to the eyepiece, enhancing the clarity and brightness of your celestial observations.The Celestron Dielectric Star Diagonal is compatible with both 2" and standard 1.25" eyepieces, thanks to the included stepdown adapter. This flexibility allows you to enjoy a wider field of view with larger eyepieces or use your existing 1.25" eyepieces. The innovative twist-lock eyepiece holder not only secures your eyepieces but also ensures optimal alignment between the telescope and eyepiece. Unlike traditional thumb screws, the twist-lock mechanism won't scratch or engrave the barrel of your eyepieces, preserving their quality and longevity.The diagonal features an integrated 2" barrel stop, protecting the mirror from potential damage by long-barreled 2" accessories. Crafted from machined black anodized aluminum, all mechanical parts of the diagonal are robust and durable. The twist-lock rings are orange anodized for easy visibility.The interior of the Schmidt-Cassegrain adapter and 2" barrel are threaded and painted flat black to prevent glare, ensuring an uninterrupted viewing experience. This diagonal also comes with two interchangeable barrels, offering versatility in connecting to a wide range of telescopes without additional adapters.The Celestron Dielectric Star Diagonal, 2" with Twist-Lock, stands out in terms of reflectivity and optical quality, delivering top performance with an over 99% reflective mirror and diffraction-limited optical quality. By simply replacing your existing diagonal with this premium one, you can significantly enhance the views from your telescope.

Fantastic improvement in my telescope. Crystal Clear Viewing. And a fantastic price, thank you.

Unbelievable change

A really high quality star diagonal.image quality is clear n crisp which is always the case with celestron products.  And the twist lock feature is a game changer. No more tiny little thumb screw gouging my eye pieces. The twist ring holds firmly n evenly. The orange ring not only looks sharp but stands out allowing u to change eye pieces in the dark more easily.

This small upgrade makes using my scope a little bit better

decided to replace the basic mirror 1.25 diagonal that came with the C8 Edge HD. A mystery why a scope with high end optics has a basic mirror diagonal - defeats the purpose of getting an HD visual.

My issue with this 'twist lock' is that it really is more of a 'screw on' where you need to turns it a lot of revolutions to get the collar tight on the eyepieces. Moreover, you REALLY have to tighten the attaching collar to the back of the OTA otherwise it is regularly loosening, especially with with 2" eyepieces. My fear is overtightening/stripping the 
threads to stop the diagonal from flopping around. 

THAT IS A CHEAP DESIGN.

Is the actual mirror visual a marked improvement from the original ? - hard to say. I bounced back and forth using the original 1.25 eyepiece - no discernible improvement in light/clarity.

On the fence. Best comment is "OK, not WOW".

OK not WOW

Perfect fit on my sct and the feel is solid.  I was worried about the weight of a 2? diagonal upgrade but it?s a little lighter that some of the others.  My Nexstar seems fine with it.  
My 1.25 eyepieces fit nicely in the adapter and my 2? eyepiece fits perfectly. Love the higher visibility orange lock collars. Overall pleased with the shipping and product.

Quality product as advertised.

I was very impressed with the fit and finish of this Celestron telescope diagonal. This allows 2 inch eyepieces to be used, which dramatically increases the quality of astronomical viewing. I have already recommended this necessary upgrade to fellow astronomy club members.

Celestron 2 inch telescope diagonal review.

Love the twist-lock mechanism for holding my eyepieces and the eyepieces stay secure. No moving or sliding around using the little thumb screws, which always seem to strip out after awhile. The dielectric is a huge upgrade over a standard diagonal.

Image is much brighter and clearer than standard stock diagonal

A must upgrade for your telescope

Excellent piece - very fine craftsmanship and makes swapping pieces very fast.

And yes, you can use it with the focal reducer, as well. Don't need to listen to those that say there is no purpose for it - it actually helps get the cheap sv305 to take some ok shots.

Excellent addition to my celestron

Very well constructed

Mirror quality great, and overall materials  used high quality.

Celestron Dielectric Star Diagonal 2"

very well built love the twist lock still waiting for good skys to really take for test drive

great for sct

I bought this to replace the diagonal that was missing from a used Celestron 9.25 CPC HD scope that I bought. Wow, I am spoiled now!  It is more convenient to change eyepieces now than before. It is a nice upgrade, and I'm glad I bought it.

Nice Upgrade

Upgraded my Evo 9.25 with this, making it much quicker and easier to attach eyepieces. The thumbscrews on the stock diagonal interfered with a couple of my eyepieces but this one fixes that problem. Eyepieces now feel more securely attached as well. Best money spent  so far.

Great upgrade for evolution

Didn't get a chance to use it yet. Seems to be well made. Fits eyepieces well too.

Celestron Dielectric Star Diagonal, 2" with Twist-Lock

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