Boost your telescope's performance without compromising optical quality—introducing the Celestron Dielectric Star Diagonal, 1.25” with Twist-Lock. Consider it the ultimate upgrade to your current star diagonal; you'll experience crisper, more luminous images without needing to swap out your entire telescope.

This deluxe diagonal alters your telescope's light path by 90 degrees, creating a more relaxed viewing position. Moreover, it features a staggering 58-layer dielectric coating on its glass surface, ensuring a more than 99% reflectivity rate. This means the maximum amount of light is directed straight to your eyepiece.

The unique twist-lock mechanism holds your 1.25" eyepieces securely in place while ensuring optimal alignment with your telescope. This is a noteworthy step up from traditional thumb screws, as the twist-lock won't cause any scratching or marring on your eyepiece barrels. An added bonus: the twist-lock comes with a built-in 1.25” barrel stop to protect the mirror from potential damage by accessories with longer barrels.

Crafted from precision-machined black anodized aluminum, the diagonal's mechanical parts are designed to last. The twist-lock rings stand out in orange anodization for easier visibility. Additionally, the barrel's interior is threaded and painted with a flat black finish to minimize glare. With its superior features and high-end finishes, the Celestron Dielectric Star Diagonal is arguably one of the finest 1.25" star diagonals Celestron has to offer.

Why Choose a Dielectric Star Diagonal over Standard Options?

When it comes to star diagonals, reflectivity and optical quality are key. This product excels in both, boasting an incredible over 99% reflective surface and diffraction-limited optics. This ensures nearly all light gathered by your telescope makes it to your eyepiece, maintaining the highest possible optical quality. Lesser quality star diagonals can both dim your views and compromise optics. By simply swapping in this premium diagonal, you'll elevate your stargazing experiences instantly

Specifications

Diagonal size:	31.75mm (1.25")
Diagonal type:	Mirror
Glass material:	BK7
Coatings:	Dielectric, 58 layers
Reflectivity;	Over 99%
Optical quality;	Diffraction limited
Eyepiece holder:	1.25", Twist-Lock
Compression ring:	Yes, single ring
Housing construction:	Machined aluminum black anodized
Barrel interior:	Glare threaded and painted flat black
Threads for filters:	Yes, 1.25"
Dimensions:	114.3mm x 50.8mm x 88.9mm (4.5" x 2" x 3.5")
Weight:	7.5 oz (212.6 g)
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Software and Documentation

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Celestron 1.25" Dielectric Mirror Diagonal, Twist-Lock

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