20mm Erecting Imaging Eyepiece

This erecting imaging eyepiece has a focal length of 20 mm and an outer diameter of 1.25 inches (31.7 mm), designed specifically for Newtonian reflector telescopes. It is constructed from durable plastic and finished in black. The eyepiece weighs approximately 65 g and measures roughly 5.5 cm in length. Its optical design corrects image orientation to deliver a fully upright and laterally correct (positive) view — essential for terrestrial observation and astrophotography alignment. Unlike standard astronomical eyepieces that produce inverted or mirrored images, this unit reflects and reorients light internally to ensure natural, intuitive viewing without additional diagonal or erecting prisms. Ideal for beginners and educators using entry-level Newtonians where correct image orientation improves usability during daytime or lunar/planetary observation.