Lunt Solar 1.25" Rack & Pinion Focuser with 10:1 Fine Focus

Lunt Solar 1.25" Rack & Pinion Focuser with 10:1 Fine Focus Introducing the New 1.25 Rack & Pinion Focuser with 10:1 Fine Focus from Lunt Solar Precision focusing at high magnifications demands more than standard rack and pinion mechanisms can deliver. While our standard focuser addresses the fundamental limitations of helical systems, the 10:1 dual-speed variant takes focus control to an entirely new level of refinement. The integrated 10:1 reduction gearing provides the micro-adjustment capability essential for critical focus applications like solar imaging, planetary observation, and high-power visual work where the difference between good focus and perfect focus determines image quality. Technical Specifications Dual-Speed Mechanism The focuser incorporates a precision planetary gear reduction system alongside the primary rack and pinion drive. The coarse focus knob provides rapid positioning across the full travel range, while the 10:1 fine focus knob enables micro-adjustments measured in thousandths of an inch. Key Specifications: Parameter Value Focuser Size 1.25" Draw Tube Drive Rack and Pinion Fine Focus Ratio 10:1 reduction Draw Tube Travel 0.5" Coarse Focus Resolution Standard rack engagement Fine Focus Resolution ±0.0002" per knob rotation Rotatable Yes Compression Ring Yes Positioning Accuracy ±0.001 inches (±0.025mm) Load Capacity 6-8 pounds (2.7-3.6 kg) Backlash <0.0005 inches when properly adjusted Materials CNC machined Aluminum and Brass Mechanical ConstructionThe Lunt Solar 1.25" 10:1 focuser employs CNC-machined aluminum and brass components, providing optimal thermal expansion characteristics and corrosion resistance for even the most rigorous astronomical applications. The dual-speed mechanism utilizes hardened steel gearing within the reduction assembly to ensure consistent performance across thousands of focus cycles. The Lunt Solar 1.25" 10:1 focuser employs CNC-machined aluminum and brass components, providing optimal thermal expansion characteristics and corrosion resistance for even the most rigorous astronomical applications. The dual-speed mechanism utilizes hardened steel gearing within the reduction assembly to ensure consistent performance across thousands of focus cycles. In the box Focuser Manuals & Warranty Lunt 5-Year Warranty