Baader Erecting Amici Prism Diagonal

Yes, it is designed to fit any standard 2-inch telescope focuser and accepts standard 2-inch eyepieces. The ClickLock system uses a 3-point clamping mechanism to secure your eyepieces firmly without scratching the barrel.

The primary advantage of an Amici prism is that it provides a correctly oriented, upright image, which is essential for terrestrial viewing. While standard mirror diagonals are often preferred for pure deep-sky astronomy, this specific Amici prism is engineered with high-end coatings and precision optics to minimize the image degradation typically found in cheaper erecting prisms.

The 44mm clear aperture is quite generous and is designed to minimize vignetting for most standard 2-inch eyepieces. However, if you are using ultra-wide-field eyepieces with very large field stops, you might experience minor light fall-off at the extreme edges of the field of view.

The 80mm optical path length is significant, so you must ensure your telescope has enough 'back focus' to reach the focal point. If you are using a telescope with limited inward focus travel, such as some Newtonian reflectors, you may struggle to achieve focus with this diagonal.

Yes. Because it features Zeiss-spec optics and a vanishingly fine roof edge, it maintains excellent clarity and contrast even at high magnifications. It avoids the diffraction spikes and astigmatism often associated with lower-quality erecting prisms.

The ClickLock system is designed for tactile, one-handed operation. You simply rotate the outer ring to lock or release the eyepiece, which is much easier to manage in the dark than fumbling with traditional thumbscrews.