Baader 1.25" Amici Prism - 45° Deflection - large aperture 24mm # 2956150. Amici prisms with a 45° deflection are primarily used for terrestrial observations. The prisms provide an upright and correctly oriented image. You can use the prism with almost all devices, except for Newton telescopes. 1.25" connection, filter thread 24mm, clear aperture, metal attachment sleeve.