Baader Planetarium Amici Prism Diagonal

A standard mirror diagonal flips the image, which is fine for astronomy but disorienting for terrestrial viewing. The Amici prism provides an erect, correctly oriented image, making it essential for birdwatching or observing landscapes where you need to see things exactly as they appear to the naked eye.

This diagonal is designed specifically for telescopes with a 1-inch focuser. Please double-check your telescope's barrel diameter before purchasing, as most modern telescopes use standard 1.25-inch or 2-inch focusers.

Yes, for terrestrial viewing, a 45-degree angle is significantly more comfortable. It allows you to look into the eyepiece while keeping your head in a natural, upright position, rather than craning your neck to look down into a 90-degree diagonal.

The 24mm clear aperture is optimized to ensure sufficient light transmission for daytime viewing. While it is not intended for deep-sky astrophotography, it provides a bright, sharp image suitable for the high-contrast conditions typical of birding and nature observation.

While you can technically use it for astronomy, it is optimized for terrestrial use. For night sky viewing, most observers prefer a 90-degree diagonal because it is more comfortable when the telescope is pointed toward the zenith, or high up in the sky.