Lunt 1.25" Rack & Pinion Focuser

Focusing mechanisms represent a critical interface between primary optical systems and observation equipment in telescopic applications. While helical focusers have historically been employed in entry-level and solar telescope systems, their inherent mechanical limitations significantly compromise optical performance. Common deficiencies in helical focuser design include excessive backlash, limited load capacity, mechanical instability under thermal cycling, and inadequate precision for high-magnification applications.

The transition from helical to rack and pinion focusing systems addresses these fundamental limitations through superior mechanical design principles and precision CNC manufacturing techniques.

Specifications:

• Focuser Size: 1.25"
• Draw Tube Drive: Rack and Pinion
• Draw tube travel: 0.5"
• Rotatable: Yes
• Compression Ring: Yes
• Positioning accuracy: ±0.002 inches (±0.051mm)
• Load capacity: 6-8 pounds (2.7-3.6 kg)
• Backlash: <0.001 inches when properly adjusted
• Materials: CNC machined Aluminum and Brass