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Explore Scientific™ David H. Levy Comet Hunter Telescope is rich in quality components. Among those is the 2? Comet Hunter Focuser, which also can be purchased separately. This dual-speed, Crayford-style focuser comes with a 2" compression ring eyepiece adapter for added versatility. This adapter allows your 2" eyepiece or barreled accessory to lock securely into place with three set screws that ensure everything will stay in place.