A3x Barlow Lens Levenhuk A3x Barlow Lens is a very useful accessory that triples your telescopes focal length, increasing the magnification of any eyepiece 3 times A3x Barlow Lens is indispensable for observing the moon, sun and solar system planets The A3x lens should be installed in front of the eyepiece The effect of aberrations is reduced to a minimum Multilayer anti-reflective coating ensures crisp and clear images