GSO Mirror Diagonal

Quartz offers superior thermal stability, meaning it is less prone to expanding or contracting as temperatures change during your viewing session. This helps maintain focus consistency, which is particularly beneficial for long imaging sessions.

This is a 2-inch diagonal, so it is designed for telescopes with a 2-inch focuser. If you have a telescope with a 1.25-inch focuser, this will not fit directly.

Yes, it includes a 2-inch to 1.25-inch adapter, allowing you to use both 2-inch and 1.25-inch eyepieces seamlessly.

The brass compression rings secure your eyepieces without using a sharp metal thumbscrew directly against the barrel. This prevents unsightly scratches and ensures a more stable, centered fit.

Dielectric coatings are highly durable and provide 99% reflectivity across the visible spectrum. This results in a noticeably brighter, higher-contrast image compared to standard aluminum-coated diagonals.

Yes, the 97.5 mm optical path length is important because it consumes a significant portion of your telescope's back-focus. Ensure your telescope has enough inward focus travel to accommodate this length before purchasing.