TS Optics Dielectric Diagonal Mirror

Yes. It comes with a 1.25-inch adapter, so you can easily use your smaller eyepieces alongside standard 2-inch accessories.

Dielectric coatings are significantly more durable and resistant to scratching than standard aluminum coatings. They also provide a higher 99% reflectivity, which results in brighter, higher-contrast views of faint deep-sky objects.

Yes, the integrated ring clamp uses a brass compression ring rather than a direct-contact set screw. This secures your eyepiece firmly without scratching or marring the barrel of your equipment.

While it provides a 90-degree viewing angle, it is primarily designed for astronomical use. It will correct the image vertically, but it does not provide a fully 'correct' (non-mirrored) image like a dedicated erecting prism would.

It is compatible with most standard 2-inch focusers. However, ensure your telescope has enough 'back focus'—the distance required for the light to come to a focus—as 2-inch diagonals have a longer optical path length than smaller 1.25-inch versions.