Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings
Celestron 2” Dielectric Star Diagonal with Twist-Lock – The Ultimate Diagonal for Maximum Light Transmission & Sharpness
A star diagonal is often an overlooked component of a telescope setup, yet it plays a crucial role in delivering the best possible image to your eyepiece. If you’re still using a standard diagonal, you may not be getting the full potential of your telescope’s optics. The Celestron 2” Dielectric Star Diagonal with Twist-Lock is a premium upgrade designed to dramatically enhance brightness, contrast, and optical alignment, without having to purchase a new telescope.
Featuring precision-machined construction, over 99% reflectivity from 58 layers of dielectric coatings, and an innovative twist-lock eyepiece holder, this diagonal ensures you get the brightest, sharpest, and most color-accurate views possible. Whether you’re a deep-sky observer, a planetary enthusiast, or an astrophotographer, this diagonal is a must-have accessory that will improve every single view through your telescope.
Why Upgrade to a Dielectric Star Diagonal?
Many astronomers don’t realize how much of a difference a high-quality diagonal can make. Lower-end diagonals, especially those included with beginner telescopes, often introduce optical imperfections, such as:
- Lower reflectivity – Less light reaches your eye, dimming the image.
- Internal reflections – Light scatter reduces contrast and sharpness.
- Inaccurate collimation – Poorly made diagonals misalign the light path, degrading resolution.
- Inferior coatings – Over time, standard aluminum-coated mirrors can fade or degrade, further reducing light transmission.
The Celestron 2” Dielectric Star Diagonal solves all of these issues, ensuring that virtually all of the light collected by your telescope reaches your eyepiece.
Ultra-High Reflectivity with 58-Layer Dielectric Coatings
Unlike standard diagonals that use aluminum or silver coatings, which typically reflect only 88-92% of incoming light, this dielectric-coated mirror boasts over 99% reflectivity.
🔭 What does this mean for your viewing experience?
- Brighter planetary details – More light transmission means sharper cloud bands on Jupiter, deeper contrast in Saturn’s rings, and fainter planetary moons become visible.
- Improved deep-sky performance – Faint galaxies, nebulae, and star clusters appear brighter and more detailed.
- Maximum optical efficiency – The light collected by your telescope isn’t wasted in reflection losses, making every observation more rewarding.
- Long-lasting performance – Unlike standard coatings, dielectric coatings won’t degrade over time, ensuring consistent performance for years.
If you’ve been using a standard diagonal, you’ll immediately notice the difference—this upgrade delivers brighter, sharper, and more detailed images with every observation.
Twist-Lock Eyepiece Holder – Secure, Scratch-Free, and Perfectly Aligned
One of the standout features of this diagonal is its twist-lock eyepiece holder, which is a major improvement over traditional thumbscrews.
Keeps eyepieces perfectly centered – Unlike traditional thumbscrews that can push the eyepiece off-axis, the twist-lock mechanism keeps your eyepiece exactly where it needs to be for perfect optical alignment.
No more scratches or damage – Standard set screws can leave marks or even dent your eyepiece barrels. The twist-lock design applies even pressure without damaging your equipment.
Effortless grip and release – Simply twist to secure or release your eyepiece in seconds, making swapping eyepieces quick and hassle-free.
This feature is especially useful for astrophotographers, ensuring that cameras, adapters, and accessories remain precisely aligned for sharp, distortion-free images.
Interchangeable Adapters – Designed for Maximum Compatibility
Unlike some diagonals that are limited to a single telescope type, the Celestron 2” Dielectric Star Diagonal is designed to work seamlessly with multiple telescope designs.
- 2” Barrel Adapter – Fits any refractor or telescope with a 2” focuser, providing a secure push-fit connection.
- SCT Thread Adapter – Threads directly onto Schmidt-Cassegrain (SCT) and EdgeHD telescopes, ensuring a rock-solid mechanical and optical connection.
Both adapters thread securely onto the diagonal housing, eliminating the need for extra adapters while providing a sturdy, wobble-free connection.
Premium CNC-Machined Construction – Built to Last
- The Celestron 2” Dielectric Star Diagonal is not just about premium optics—it’s also built like a tank.
- Precision-machined aluminum body – Durable, lightweight, and resistant to corrosion.
- Black anodized finish – Ensures a sleek, professional look while adding durability.
- Glare-threaded, flat-black interior – Prevents internal reflections, enhancing contrast for the best possible views.
- Integrated 2” barrel stop – Protects the diagonal mirror by preventing long-barrel accessories from causing damage.
- Distinctive orange anodized twist-lock rings – Easy to see in the dark, making eyepiece changes effortless.
This combination of premium materials and engineering ensures that your diagonal will provide peak performance for years to come.
Standard Star Diagonals vs. Dielectric Star Diagonal – Why It Matters
A high-quality diagonal is just as important as the rest of your optical train. If your diagonal isn’t reflecting all of the light effectively, you’re losing detail, brightness, and contrast.
🔍 Standard Star Diagonal (Typical Coatings)
- Reflectivity: 88-92%
- Optical Quality: Basic aluminum coatings, prone to degradation over time
- Alignment: Set screws can push eyepieces slightly off-axis, leading to optical misalignment
- Best for: Entry-level use
🔍 Celestron 2” Dielectric Star Diagonal
- Reflectivity: Over 99%
- Optical Quality: 58-layer dielectric coatings for maximum contrast and brightness
- Alignment: Twist-lock holder ensures perfect centering for superior views
- Best for: Anyone who wants to get the best performance out of their telescope
If you want to maximize the potential of your optics without breaking the bank, upgrading to a dielectric star diagonal is one of the best investments you can make.
Why Choose the Celestron 2” Dielectric Star Diagonal with Twist-Lock?
- Over 99% reflectivity – Brighter, sharper views with minimal light loss.
- 58-layer dielectric coatings – Long-lasting performance that won’t degrade over time.
- Diffraction-limited optical quality – Maintains the full resolution of your telescope.
- Twist-lock eyepiece holder – Perfect alignment without damaging your eyepieces.
- Multiple connection options – Works with both 2” focusers and SCT threads.
- Precision CNC-machined aluminum construction – Built for decades of use.
- Glare-threaded, flat-black interior – Eliminates reflections for maximum contrast.
Whether you’re an avid observer, an astrophotographer, or simply looking to enhance the quality of your telescope’s views, the Celestron 2” Dielectric Star Diagonal with Twist-Lock is a game-changing upgrade.
🚀 Upgrade your viewing experience—order yours today and see the difference!
