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Home > Telescope accessories > Focusers > Focusers > Lumicon > Lumicon Low-Profile 1.25in Focuser for Newtonian on 3inch Base with 2.25 inch hole pattern

Lumicon Low-Profile 1.25in Focuser for Newtonian on 3inch Base with 2.25 inch hole pattern

Product no.: 20319
Manufacturer: Lumicon

$ 338.00

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Product description
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Product description:

In the case that this article currently is not available from the warehouse, please note the following: we order from this supplier in regular intervals. Please place your order now, so that we may take into account your order and deliver the article to you by the above-mentioned date.

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.


  • 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.

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