Sometimes you need that precision focus adjustment, especially for high-power observing or for making images. The Two-Speed 10:1 Focus Knob Mechanism for the 2.5-inch HEX Focusers found on Explore FirstLight and select BRESSER Messier telescopes, provides a smooth course focus and a precision ultra-fine focus.

Features

• Precision all-metal construction with stainless-steel ball bearing for super-smooth action.
• Attractive silver and black bead-blast finish.
• Dual-Speed focusing mechanism with a 10:1 reduction ratio for course and ultra-fine focusing.
• Weighs only 5.6 oz. (159 grams)