Omegon 90° Amici prism 1.25″ - erect and correctly oriented image for your telescope
If you use your telescope not only for the night sky but also for observing nature, landscapes, or distant objects on Earth, you probably know how inconvenient a mirror-reversed or flipped image can be. That is exactly why the Omegon 90° Amici prism was developed - an elegant and optically precise solution that delivers an image that is both upright and laterally correct, exactly as you see it with the naked eye.
Why a standard diagonal is not enough for daytime observation
A standard star diagonal or BAK-4 prism rotates the image by 90° but flips it laterally - the left side remains on the right and vice versa. For astronomical observation this is generally acceptable, since the orientation of the night sky has no practical impact. During terrestrial observation - for example when watching birds, boats, or during hiking - a mirror-reversed image is very confusing.
The Amici prism solves this problem thanks to its special optical design featuring a characteristic "roof" (Amici) element, which correctly flips the image along the left-to-right axis as well. The result is a natural, upright, and laterally correct view, comparable to what you see without a telescope.
Key features
- Deflection angle: 90°
- Barrel diameter: 1.25″ (31.7 mm) - the most widespread standard in astronomical and observational optics
- Erect and laterally correct image - no more mental "flipping" of the scene
- Minimal light loss thanks to quality anti-reflection coatings
- Good contrast retention even at higher magnifications
- Compatible with a wide range of telescopes
Who is this prism designed for?
The Amici prism is especially appreciated by those who use their telescope universally - both for night-time astronomy and for daytime observation of nature or sporting events. It is also an excellent choice for owners of spotting scopes and refractors who want comfortable viewing with a 90° ergonomic deflection without any compromise in image orientation.
The correctly oriented image makes this accessory a practical everyday tool - whether you are birdwatching, tracking ships, hiking, or simply enjoying a scenic view.
Compatibility
The Omegon 1.25″ Amici prism is designed for the standard 1.25″ (31.7 mm) eyepiece holder, which is today the most common standard in both astronomical and observational optics. It is compatible with a wide range of telescopes including refractors, reflectors with focusers accepting 1.25″ accessories, and most spotting scopes with the appropriate adapter.
About Omegon
Omegon is an established European brand focused on astronomical and observational optics, with an emphasis on accessibility, reliability, and technical quality. Omegon products are designed with the needs of real users in mind - from beginners to experienced amateur astronomers. The wide range includes telescopes, eyepiece accessories, mounts, and optical add-ons, making it easy to put together a complete observation setup. By choosing Omegon accessories you get proven quality at a reasonable price, with easy availability of spare parts and compatible products.
Summary
The Omegon 90° Amici prism 1.25″ is a practical and affordable accessory that significantly expands the possibilities of your telescope and brings everyday observing comfort - without the need to mentally flip the image in your head.
