Premium 3-Inch Dual-Speed GEARED Focuser w/ Linear Rails - 80mm Travel, M110x1 Thread, Symmetrical Design (Left/Right Hand Compatible), EAF Ready (4mm D-Shaft)
Experience robust, precise, and slip-free focusing with our high-end 3-inch (76.2mm) dual-speed GEARED (rack-and-pinion) focuser. Engineered for demanding astronomy and astrophotography, this focuser delivers positive mechanical engagement, exceptional load capacity, and smooth operation.
Key Features & Benefits:
Dual-Speed Geared Precision (10:1 Ratio): Combines robust rack-and-pinion gearing for secure, slip-free movement with a 10:1 fine speed reducer. Achieve rapid coarse adjustments and incredibly fine micro-focus control, essential for high-magnification viewing and critical astrophotography focus. No slipping under heavy loads!
Linear Ball Bearing Rails: Ensures smooth, rigid, and low-friction movement throughout the entire 80mm focus travel. Minimizes binding and provides stable support.
Full Symmetrical Design: Features a unique left/right reversible configuration! Easily swap the focus knobs to the opposite side. Perfect for:
Left-Handed Astronomers: Enjoy ergonomic comfort by positioning the knobs for your dominant hand.
Binoviewer/Binocular Telescope Builders: Install two focusers symmetrically on a single OTA for a balanced dual-view setup.
Heavy-Duty M110x1 Threaded OTA Interface: Equipped with a robust M110x1 male thread for secure and direct mounting onto Optical Tube Assemblies (OTAs) with compatible threads or via common adapters.
Electronically Assisted Focusing (EAF) Ready: Seamlessly integrates with popular Electronic Auto Focusers (EAF). Features a standard 4mm (D-shaft) coupling on the fine-focus shaft for direct motor attachment.
80mm Focus Travel: Provides ample inward and outward movement to accommodate a wide range of eyepieces, cameras, binoviewers, and filter wheels.
Premium Geared Construction: Built with high-quality materials and precision-cut gearing for exceptional durability, stability, and reliable long-term performance. Smooth operation with minimal play.
Positive Engagement: The geared design guarantees no slip or mirror flop, even with heavy camera setups or binoviewers.
Ideal For:
Upgrading refractors, reflectors (Newtonians), or catadioptric telescopes needing robust focus control.
Astro-imagers demanding absolute slip-free precision and stability.
Visual observers using heavy accessories like binoviewers or large eyepieces.
Left-handed astronomers seeking ergonomic operation.
Builders constructing premium binocular telescopes.
Upgrade your telescope with reliable, high-performance focusing. Enjoy the confidence of positive mechanical engagement combined with smooth dual-speed precision.