APM diagonal mirror 90° 99% 2″
Looking for a diagonal mirror that won't let you down even during the most demanding observation sessions? The APM 90° diagonal mirror with 99% reflectivity is the answer for anyone who refuses to compromise on optical quality. Whether you are dedicated to visual observation of planets and double stars, or you capture astrophotographs, this diagonal will offer you the maximum performance from your telescope.
Exceptional optical precision
At the heart of this diagonal is a highly accurate optical element with a surface accuracy of 1/10 wavelength - a level that is especially appreciated by planetary observers and those who demand a sharp, high-contrast image free of aberrations introduced by the diagonal itself. Reflectivity reaches an exceptional 99%, which means minimal light loss and faithful rendering of colours and fine details. In practice you will notice the difference immediately: the image is bright, clean and neutral, free of any unwanted colour cast.
Robust metal construction and practical features
The premium APM 2″ diagonal is designed to connect to both the telescope and eyepieces via a standard 2″ barrel. The body is made from metal, which guarantees mechanical stability and long service life - no play, no unwanted shifts at focus. The weight of 600 g corresponds to the solid metal construction and at the same time presents no problem even for medium-sized mounts. The diagonal includes a filter thread, so you can attach a lunar or colour filter directly to the diagonal without the need for any additional adapter. The ring clamp ensures secure retention of the eyepiece without the risk of scratching or loosening during handling.
T2 connector for astrophotography
For photographers, a key detail is the presence of a T2 connector on the camera side. This allows the diagonal to be connected directly to a camera or planetary camera via the standard T2 thread - there is no need to source additional adapters, and the entire optical train remains straight and mechanically rigid. This is a significant advantage during long exposures or when capturing planetary videos, where every micrometre of play affects the sharpness of the image.
What is included in the package
- APM 90° diagonal mirror 99% 2″
- 2″ to 1.25″ adapter - ready to use with a smaller eyepiece collection immediately out of the box
With the included adapter you can immediately use the diagonal with your existing 1.25″ eyepieces without investing in any additional accessories.
Technical specifications
| Parameter |
Value |
| Barrel diameter |
2″ |
| Deflection angle |
90° |
| Reflectivity |
99% |
| Surface accuracy |
1/10 wavelength |
| Body material |
Metal |
| Weight |
600 g |
| Camera connection |
T2 thread |
| Filter thread |
Yes |
| Eyepiece clamp |
Ring clamp |
| Included adapter |
2″ to 1.25″ |
Summary
If you are looking for a diagonal mirror that meets the requirements of both visual observers and astrophotographers, the APM diagonal mirror 90° 99% 2″ is a choice you will not regret. Precise optics, a robust metal body, and practical additions such as the T2 connector and filter thread - all in one place, ready to use straight away.
