Baader Planetarium Amici Prism Diagonal

The primary advantage of an Amici prism is that it provides a correctly oriented, upright image. While standard mirror diagonals are excellent for astronomy, they flip the image, which can be disorienting for terrestrial viewing. This prism is specifically engineered to make spotting birds or distant landscapes intuitive.

The Clicklock mechanism uses a rotating collar to apply even pressure around the entire barrel of your eyepiece. Unlike traditional thumbscrews, which can mar the finish of your gear or cause the eyepiece to tilt slightly, this system ensures a secure, centered fit without scratching.

This unit is designed with a 2-inch barrel. To use your 1.25-inch eyepieces, you will need to purchase a separate 2-inch to 1.25-inch adapter, as one is not included with the diagonal itself.

While it is a high-quality optical component, Amici prisms can sometimes introduce a faint diffraction spike on very bright stars due to the roof edge of the prism. For pure, high-magnification planetary or deep-sky astronomy, a high-end mirror diagonal is often preferred, but for terrestrial use and general observing, the performance is excellent.

Yes, the 90-degree angle is standard for telescope diagonals and provides a comfortable viewing position when the telescope is pointed at the horizon or slightly above it. It allows you to look down into the eyepiece rather than straining your neck to look straight through the back of the scope.