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K001 1.25” Double-threaded Focuser for Astronomical Telescope

K001 1.25” Double-threaded Focuser for Astronomical Telescope

K001 is a 1.25-inch double-threaded focuser made of all metal for astronomical telescopes. It features a 10mm adjustment stroke, 0.05mm precision, and maintains non-rotating linear movement for eyepieces or zenith mirrors during focusing. Designed for stable, smooth operation at high magnifications, it supports guide mirrors and finder interfaces with M42x0.75 top and M31x0.5 bottom external threads.

  • All-metal construction ensures durability and long-term use in field and observatory conditions
  • Double-threaded helical design enables high-precision fine focusing with 0.05mm accuracy
  • Non-rotating linear movement keeps eyepieces and zenith mirrors aligned during focus adjustment
  • Compact size with minimum height 43mm and maximum height 53mm fits standard telescope setups
  • Supports both guide mirrors and finder scopes via M42x0.75 and M31x0.5 external threads
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Technical features

  • Double-threaded helical focuser with 10mm adjustment stroke
  • Adjustment accuracy 0.05mm for high-precision focusing
  • Inner diameter 1.25 inches for standard eyepiece and accessory compatibility
  • Top external thread M42x0.75 for guide mirror or finder attachment
  • Bottom external thread M31x0.5 for telescope tube or mounting interface
  • Minimum height 43mm, maximum height 53mm for compact integration
  • All-metal construction ensures rigidity and resistance to wear
  • Non-rotating linear movement maintains alignment of inserted optics

Who it is for

  • Amateur and professional astronomers using 1.25-inch eyepieces and accessories
  • Telescope manufacturers integrating precision focusers into new optical systems
  • Distributors sourcing reliable, standardized focusers for astronomy accessory kits

Specifications

ModelK001
Inner Diameter1.25 inch
Adjustment Stroke10mm
Adjustment Accuracy0.05mm
Top External ThreadM42x0.75
Bottom External ThreadM31x0.5
Minimum Height43mm
Maximum Height53mm
MaterialAll metal
Focuser TypeDouble-threaded helical

Use guide

  • Mount the focuser on the telescope tube using the M31x0.5 bottom thread
  • Attach guide mirror or finder scope using the M42x0.75 top thread
  • Insert 1.25-inch eyepiece or zenith mirror and adjust focus using the helical knob
  • Ensure the eyepiece remains non-rotating during adjustment for consistent alignment

FAQ

What is the adjustment accuracy?
0.05mm per full turn of the helical knob.
Does the eyepiece rotate during focusing?
No. The design ensures linear movement only, keeping the eyepiece or mirror non-rotating.
What threads are on the top and bottom?
Top: M42x0.75; Bottom: M31x0.5.
Is it compatible with 1.25-inch eyepieces?
Yes. Inner diameter is 1.25 inches, standard for most astronomical eyepieces.
What is the height range?
Minimum 43mm, maximum 53mm when fully extended.

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