TPO Quartz Dielectric Diagonal

Quartz offers superior thermal stability, meaning the mirror is less likely to expand or contract as temperatures drop during a long night of observing. This ensures your optical alignment stays precise, giving you consistent image quality throughout your session.

This diagonal is designed for 2-inch focusers, which is standard for most larger telescopes. It also includes a 2-inch to 1.25-inch adapter, so you can easily use both 2-inch and 1.25-inch eyepieces without needing extra equipment.

Instead of a metal thumbscrew pressing directly against the barrel of your eyepiece, the brass compression ring applies even, gentle pressure around the entire circumference. This prevents scratches and marring on your eyepiece barrels while keeping them securely centered.

Yes, the diagonal is threaded to accept standard 2-inch filters. This allows you to easily swap in light pollution, planetary, or nebula filters without having to remove the diagonal from your telescope.

A 99% reflectivity rating means that almost all the light entering the diagonal is reflected to your eye, resulting in a brighter, higher-contrast image. Dielectric coatings are also significantly more durable and scratch-resistant than standard aluminum coatings.