Celestron manufactures the Ultima line of prismatic spotting scopes in 65mm, 80mm, and 100mm varietals to suit your needs. The larger two can also be had with extra-low dispersion (ED) glass elements, an expensive product that produces a marked improvement in the color fidelity, resolution, and edge delineation of the scope's imagery. All the Ultima line are mated to an eyepiece and render views that are both rightside up and laterally correct to the world, making them good for both terrestrial and celestial observing. All Ultimas are waterproof, making them more robust than ever before. Celestron surely is delivering exceptional value.