Omegon Carbonline 90° Dielectric 99% 1.25″ Diagonal Mirror
If you are looking for a diagonal mirror that truly makes the most of your telescope's light, the Omegon Carbonline is exactly what you need. It combines premium 99% dielectric reflectivity with a sleek carbon-look design and thoughtful engineering details that every experienced observer will appreciate. Whether you are observing planets, the Moon, or bright star clusters, this diagonal delivers a sharp, high-contrast image with minimal light loss.
Outstanding reflectivity where it matters
At the heart of this diagonal is a flat mirror coated with multi-layer dielectric reflective coatings, achieving up to 99% reflectivity. Compared to standard aluminium coatings (around 88-90%) or silver coatings (around 95%), the difference is clearly visible - especially when observing fainter objects or using a telescope with a slower focal ratio. The result is an image with high contrast, accurate colours, and minimal brightness loss - exactly as it should be.
Why the diagonal mirror matters more than you think
Many observers invest in a quality telescope and eyepieces, yet overlook the diagonal mirror. Every single photon of light passes through it on the way to your eye - any loss of reflectivity directly reduces the brightness and contrast of the final image. A dielectric mirror with 99% reflectivity is today's standard for serious visual observing, and the Omegon Carbonline delivers it at a very reasonable price.
Practical design that protects your eyepieces
The diagonal is designed for standard 1.25″ (31.7 mm) barrel size, making it fully compatible with the vast majority of refractors, reflectors, and catadioptric telescopes on the market. The eyepiece is secured using a full-ring compression clamp - a design that will please anyone who values their eyepieces. The chrome barrel of the eyepiece will not get scratched even after many insertions and removals, because the clamping force is spread evenly around the full circumference rather than concentrated at a single point screw. The sides of the body feature a modern carbon-look finish that gives the accessory a premium appearance and a comfortable feel in the hand.
Who is this diagonal for?
The Omegon Carbonline 90° Dielectric is an excellent choice for:
- Beginners who want to start with quality accessories from the very first session
- Experienced observers looking for a reliable upgrade to the average diagonal supplied with their telescope
- Anyone who wants sharp, bright views of planets, the Moon, and star clusters without unnecessary light loss
Once you get used to 99% reflectivity, you will not want to go back to an ordinary diagonal mirror.
Technical specifications
| Parameter |
Value |
| Type |
Diagonal mirror |
| Angle |
90° |
| Coating type |
Dielectric (multi-layer) |
| Reflectivity |
99% |
| Barrel size |
1.25″ (31.7 mm) |
| Eyepiece holder |
Full-ring compression clamp |
| Body finish |
Carbon-look |
| Compatible with |
Refractors, reflectors, catadioptric telescopes |
