Celestron 2" Dielectric Star Diagonal, Twist-Lock

Celestron Dielectric Star Diagonal 2” with Twist-Lock – Premium Optics for Brighter, Sharper Views

Maximise light transmission and elevate your viewing experience with the Celestron Dielectric Star Diagonal, 2” with Twist-Lock. Designed for discerning astronomers, this premium-quality diagonal offers a simple yet transformative upgrade that significantly enhances image brightness, contrast, and sharpness—without the need to invest in a brand-new telescope.

Whether you're observing planets, deep-sky objects, or lunar detail, this 2" star diagonal delivers exceptional optical performance and user-friendly engineering, making it a must-have accessory for any serious stargazer.

Superior Reflectivity with Dielectric Coatings

At the heart of this diagonal is a precision-polished mirror coated with 58 layers of dielectric material, providing over 99% reflectivity across the visible spectrum. This ultra-high reflectivity ensures maximum light throughput, preserving the full brightness and clarity of your telescope’s image. Lesser diagonals can significantly degrade your view—but with this premium Celestron model, virtually all the light collected by your telescope reaches your eyepiece, offering a noticeable visual improvement.

Versatile Compatibility with 2” and 1.25” Eyepieces

Expand your observing potential with support for larger 2” eyepieces, which provide a wider field of view ideal for deep-sky observing. A stepdown adapter is also included, allowing seamless compatibility with standard 1.25” eyepieces. This flexibility makes the diagonal suitable for a wide range of telescope setups and viewing preferences.

Innovative Twist-Lock Mechanism for Secure Eyepiece Fit

Unlike traditional thumb screws that can misalign or damage your eyepieces, Celestron’s twist-lock system holds eyepieces securely and keeps them perfectly centred. This ensures optimal alignment between your telescope and eyepiece, preserving both mechanical and optical integrity. The integrated 2” barrel stop adds an extra layer of protection, preventing long-barrelled accessories from contacting and damaging the mirror.

Built to Last – Precision Machined and Anodised

Crafted from high-grade machined aluminium with anodised black and orange finishes, this diagonal is as rugged as it is refined. The bright orange twist-lock ring adds visibility in low-light conditions, while the glare-threaded interior and flat-black paintwork in the barrel and adapter reduce stray light and internal reflections. It’s not just a tool—it’s a precision-engineered upgrade designed to last a lifetime.

Dual-Barrel System for Maximum Telescope Compatibility

This diagonal includes two interchangeable barrels for maximum versatility:

• A standard 2” barrel for refractor and other telescopes with 2” focusers.

• A threaded SCT barrel designed specifically for Schmidt-Cassegrain telescopes.

Both barrels thread directly onto the diagonal housing, ensuring a secure, wobble-free connection without the need for additional adapters.

Why Upgrade to a Dielectric Star Diagonal?

Standard star diagonals typically use mirrors with lower reflectivity and may introduce optical aberrations, resulting in dimmer and less sharp images. The Celestron Dielectric Star Diagonal offers:

• Over 99% reflectivity for brighter views

• Diffraction-limited optical quality

• Improved contrast and resolution

• Enhanced overall telescope performance

A diagonal might seem like a small part of your setup, but upgrading to a premium model can have a dramatic impact on your visual astronomy. It's a smart investment for any astronomer who values quality and performance.

Key Features:

• 2” mirror star diagonal with 58-layer dielectric coatings

• Over 99% reflectivity for maximum light transmission

• Accepts both 2” and 1.25” eyepieces (adapter included)

• Secure, non-marring twist-lock eyepiece holder

• Dual barrel system: 2” and SCT-threaded barrels included

• Durable, CNC-machined aluminium construction

• Glare-reducing interior threading and flat black paint

• Barrel stop prevents mirror damage from long accessories

Upgrade Your Telescope – See the Difference

Experience sharper, brighter, and more immersive celestial views with the Celestron Dielectric Star Diagonal, 2” with Twist-Lock. It’s the perfect way to unlock the full potential of your telescope—no new optics required.

Order now and take your stargazing to the next level.