Skywatcher 12.5mm Illuminated Plossl Eyepiece : A high quality double crosshair 12.5mm super plossl eyepiece. This eyepiece is ideal for manual guiding and also drift alignment. Drift aligning helps to achieve a more accurate polar alignment which enables longer exposure times without auto-guiding. Due to the double crosshair central box helps keep guide star/image in the center of the field. The lens elements are multi-coated to enhance light intensity and deliver maximum bright images. This multi-function eyepiece from Skywatcher features a laser-etched, double line crosshair reticle with a built-in battery powered red led illuminator.