QUALITY ED OBJECTIVE LENS: Extra-low dispersion optical glass with special dispersion properties to dramatically reduce chromatic aberration, rendering razor-sharp images with superb color correction. Enjoy true-to-life color with enhanced resolution and contrast. XLT LENS COATINGS: Fully multi-coated with Celestron’s proprietary XLT optical coatings – the same coatings used on observatory-class telescopes. This coating maximizes light transmission through the optical path for brighter images. A great addition to your field gear!