Lenses Super Plossl 12.5mm, diameter 31.8mm (1 1/4") ideal for telescopes. They feature 4 top-quality elements. Their design ensures high performance with an apparent field of 52º. They are multi-coated with blackened edges, offering high contrast and minimizing spherical and chromatic aberrations, as well as astigmatism and distortion. Additionally, stray light is minimized by the folding rubber extensions.