Lunt 1.25" Rack & Pinion Focuser

• Purpose-built upgrade from helical to rack & pinion for tighter, more repeatable focus on solar and night-sky targets

• CNC-machined aluminum & brass construction for rigidity, smooth motion, and excellent thermal stability

• Precision drive system supports 6–8 lb (2.7–3.6 kg) imaging trains—no more sag, slip, or focus creep with heavier eyepieces, cameras, or filter wheels

• Ultra-low backlash (<0.001") with ±0.002" (±0.051 mm) positioning accuracy keeps you exactly on band at high magnification

• Internal brake & variable drag control: set tension how you like it, then positive lock to eliminate focus drift during long captures

• Rotatable body makes framing your sensor or eyepiece easy without disturbing focus

• Brass compression ring grips accessories evenly—no marring, no tilt, better repeatability than set-screw clamps

• Short 0.5" (12.7 mm) travel for fine, predictable focusing in high-resolution solar work

• Retrofit-friendly for scopes that shipped with helicals: a drop-in path to better precision, load capacity, and long-term reliability

• Ideal for solar imagers, high-mag visual, and anyone who’s outgrown the limits of a helical focuser

Specifications

• Size / Interface: 1.25"

• Drive Type: Rack & pinion

• Drawtube Travel: 0.5" (12.7 mm)

• Rotatable: Yes

• Compression Ring: Brass, 360° clamping

• Positioning Accuracy: ±0.002" (±0.051 mm)

• Backlash: <0.001" (properly adjusted)

• Load Capacity: 6–8 lb (2.7–3.6 kg)

• Materials: CNC-machined aluminum and brass

• Brake / Tension: Internal variable drag with positive lock

What’s in the Box?

• Lunt 1.25" Rack & Pinion Focuser (CNC aluminum/brass)

• Integrated brass compression-ring clamp

• Built-in brake and tension controls

• User documentation