Omegon 90° diagonal mirror 1.25″
Every astronomer knows how uncomfortable it can be to crane your neck when observing objects high above the horizon or directly at the zenith. The Omegon 90° diagonal mirror is an elegant and practical solution that lets you observe stars, planets, and deep-sky objects at any altitude - comfortably and without unnecessary strain.
Wide compatibility with refractors and catadioptric telescopes
This diagonal mirror for 1.25″ telescopes uses the standard 31.7 mm barrel diameter, making it compatible with the vast majority of refractor and catadioptric telescopes available on the market. It is worth noting that this accessory is not intended for Newtonian reflectors - due to their optical design, the focuser is oriented differently, and a diagonal mirror is neither needed nor functional with them. If you own a refractor, a Schmidt-Cassegrain, or a Maksutov telescope, this diagonal mirror is the perfect match for your setup.
Secure eyepiece retention
The eyepiece is held in place by two thumbscrews, ensuring a reliable and stable fit with no risk of slipping or unwanted movement during observation. This solution is especially appreciated when using heavier eyepieces or when tilting the tube into various positions.
Built-in filter thread - a small detail that makes a big difference
One of the most practical features of this diagonal mirror is the internal filter thread for standard 1.25″ astronomy filters. There is no need to unscrew a filter from one eyepiece and attach it to another every time you change magnification - simply leave the filter threaded into the diagonal's barrel and swap eyepieces as needed. This seemingly minor detail proves to be a significant advantage in practice, especially during planetary observation sessions when you frequently switch between different magnifications and want to avoid wasting time or risking damage to the filter thread.
Quality and reliability from Omegon
Omegon is a well-established brand among astronomers, recognized for its attention to build quality and thoughtful design details. The 90° diagonal mirror 1.25″ is no exception - it offers solid mechanical construction, standard dimensions ensuring compatibility with a wide range of accessories, and the convenient addition of a built-in filter thread. Whether you are a beginner or an experienced astronomer looking for reliable and practical accessories at a reasonable price, this diagonal mirror is an excellent choice for any refractor or catadioptric telescope.
Key features at a glance
- 90° viewing angle for comfortable observation at any altitude
- Standard 1.25″ (31.7 mm) barrel diameter
- Compatible with refractors and catadioptric telescopes (Schmidt-Cassegrain, Maksutov)
- Not suitable for Newtonian reflectors
- Dual thumbscrew eyepiece lock for secure and stable hold
- Internal 1.25″ thread for astronomy filters
- Solid mechanical build with precise dimensions
Specifications
| Parameter |
Value |
| Deflection angle |
90° |
| Barrel diameter |
1.25″ (31.7 mm) |
| Eyepiece locking mechanism |
Two thumbscrews |
| Filter thread |
Standard 1.25″ |
| Compatible telescope types |
Refractor, Schmidt-Cassegrain, Maksutov |
| Brand |
Omegon |
