Lumicon Low-Profile 1.25in Focuser For Newtonian On 3inch Base With 2.25 Inch Hole Pattern

The Lumicon Low Profile 1.25″ Focuser for Newtonian on 3in Base is a high-precision, pin-and-groove type helical focuser. The draw-tube does not rotate. The low-profile design quickly and easily converts your standard Newtonian to a camera-ready telescope. For visual use, the smooth focusing brings out the very best in your telescope’s optics. Accessories that take up back-focus, such Lumicon’s popular 1.25″ Multiple Filter Selector, can be used with ease and convenience. The U-groove base aligns and sits flush on any telescope tube with a radius of 3.5″ or larger.

Specifications:

• Focuser Minimum Height Above Tube*
• 1.75″ (for 3.5″ radius tube)
• 2″ (for flat-base mounting)
• Turns ratio: 2 per inch
• Travel: 1″
• Resolution/Backlash: < 0.0005"
• Image shift: Negligible
• Reverse action: Negligible
• “Stiction:” Negligible
• Footprint: 3″ square
• Hole Pattern: Square; 2.25″ center-to-center
• Min/Max Focuser Hole diameter: 1.5″/2.7″
• Operating range: to 20&degF/- 7° C
• Maximum recommended load: 3 lb.
• Mounting Hardware: 8-32, included

  *Precise minimum depends on radius of tube.