Celestron 51635 StarPointer Pro Finderscope (Black) Designed by astronomers for astronomers, this premium finderscope allows you to precisely zero in on your target Projects a dual-circle reticle, not a red dot that can obscure your subject Larger 40 mm optical window offers a wider field of view so you can acquire targets quickly and easily Brighter LED for easy visibility during the day Easy dovetail connection; no tools required