Prism 45° Amici 1.25" 2956150 — 45-degree 1.25-inch Amici roof prism for telescopes

The Prism 45° Amici 1.25" is a 45-degree Amici roof prism designed for use with telescopes that accept 1.25-inch eyepieces. It delivers an erect image and redirects the optical path by 45 degrees, providing a more comfortable viewing angle for terrestrial observation and visual astronomy. The prism is sized to fit standard 1.25" focusers and eyepiece barrels and is intended for observers who need an upright image without additional image rotation.

Advantages

This Amici prism produces an erect image suitable for daytime viewing and nature observation, removing the need for additional image-erecting accessories. Its 45-degree angle offers a comfortable eyepiece position for prolonged observation sessions. The roof prism design simplifies framing and composition when using the telescope for terrestrial subjects, and the 1.25" format ensures compatibility with a wide range of eyepieces and standard focusers.

Suitable for

• Terrestrial observation and birdwatching through a telescope
• Daytime astronomy where upright images are required
• Astroimaging setups that benefit from an erect view
• Observers using telescopes with 1.25" focusers and eyepiece holders

Key specifications

• Optical type: Amici (roof) prism
• Angle of deviation: 45 degrees
• Barrel size: 1.25 inch
• Function: image erection and 45° redirection of the optical axis

How to use

Insert the prism into the telescope’s 1.25" focuser or eyepiece holder in place of a standard eyepiece or diagonal. Secure the prism with the focuser’s thumbscrews and then insert the eyepiece into the rear barrel of the prism, tightening its set screws as needed. Aim the telescope at the target and achieve focus by adjusting the focuser while observing through the eyepiece; the prism will present an upright image oriented for comfortable viewing at a 45° angle. Remove the prism when switching to imaging modes or optical paths that require a direct straight-through configuration.

Usage recommendations

Use the prism in moderate to bright daylight and terrestrial viewing conditions to take full advantage of the erect image. Verify that your eyepiece barrel and focuser collar clearances allow full insertion of the 1.25" prism; some eyepieces with long barrels or accessories may require repositioning. For best optical alignment, ensure the prism is seated firmly and avoid overtightening set screws which can decenter the optical element.