Apertura SCT Mirror Diagonal

Yes, this diagonal is designed specifically for SCTs. It features a standard 2-inch barrel that inserts directly into the visual back of most Schmidt-Cassegrain telescopes.

The twist-lock mechanism uses an internal compression ring that tightens evenly around the entire barrel of your eyepiece. This provides a much more secure grip and better centering than a traditional thumbscrew, which can sometimes tilt the eyepiece or scratch its barrel.

Yes, it includes a 2-inch to 1.25-inch adapter. This adapter also features a brass compression ring, ensuring your smaller eyepieces are held securely without being marred by metal set screws.

The primary benefit is weight reduction. By using carbon fiber, the diagonal is lighter than traditional all-metal models, which helps minimize strain on your telescope's focuser and keeps your overall imaging train balanced.

The 1/12th wave rating refers to the precision of the mirror's surface flatness. A higher number indicates a more accurate surface, which translates to sharper, higher-contrast images, especially at high magnifications.

The 134mm optical path length is standard for this type of diagonal, but it is important to ensure your telescope has enough 'back focus' to accommodate it. If you are using a standard SCT, you should have plenty of travel, but those using specialized imaging setups should verify their specific back-focus requirements.