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The Low Profile 1.25" Focuser for Newtonian, 3.5" Base, is a high-precision, pin-and-groove type helical focuser. The 3.5" base provides for replacing larger focusers with a center-to-center hole-spacing of 2.75". The draw-tube does not rotate.
Accessories that take up back-focus, such Lumicon's popular 1.25" Multiple Filter Selector, can be used with ease and convenience. The high-precision, smooth focusing brings out the very best in your telescope's optics. The low-profile design quickly and easily converts your standard Newtonian to a camera-ready telescope. The U-groove base aligns and sits flush on any telescope tube with a radius of 4.5" or larger.

Specifications:

• Focuser Minimum Height Above Tube*
• 1.75" (for 4.5" 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: 3.5" square
• Mounting hole pattern: Square; 2.75" center-to-center
• Min/Max focuser hole diameter: 1.5"/3.3"
• Operating range: to 20&degF/- 7° C
• Maximum recommended load: 3 lb.
• Mounting Hardware: 8-32, included
  
  *Precise minimum depends on radius of tube.