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K003 Fine-tuning Seat SCT Internal Thread Adapter for Telescope

K003 Fine-tuning Seat SCT Internal Thread Adapter for Telescope

K003 Fine-tuning Seat SCT Internal Thread Adapter is a metal adapter for astronomical telescopes with SCT internal thread interfaces. It connects a 1.25″ eyepiece to the telescope's internal SCT thread, enabling precise focusing with a 10 mm focusing stroke and 0.5 mm accuracy. Designed for use with fine-tuning seats in the Double Helix series.

  • All-metal construction ensures durability and stable alignment during long exposure observations
  • 10 mm focusing stroke with 0.5 mm accuracy supports fine focus adjustments for planetary and lunar imaging
  • 1.25″ eyepiece interface compatible with standard eyepieces used in amateur astronomy
  • SCT internal thread interface fits telescopes with internal threading (e.g., Celestron CGE, C8, C9.25)
  • Double helix fine-tuning seat design enables smooth, backlash-free motion for critical focus control
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Technical features

  • Host interface: Internal SCT thread interface
  • Eyepiece interface: 1.25″
  • Focusing stroke: 10 mm
  • Focusing accuracy: 0.5 mm
  • Material: All metal
  • Designed for use with Double Helix fine-tuning seat series
  • Thread compatibility: Internal SCT (e.g., Celestron C8, C9.25, CGE series)
  • Smooth, backlash-free motion via double helix mechanism

Who it is for

  • Amateur astronomers upgrading telescope focus systems
  • Astrophotography enthusiasts needing precise focus control
  • Importers sourcing accessories for SCT telescope kits
  • Distributors building astronomy accessory catalogs for observatories and clubs

Specifications

ModelK003
Host InterfaceInternal SCT Thread
Eyepiece Interface1.25"
Focusing Stroke10 mm
Focusing Accuracy0.5 mm
MaterialAll Metal
SeriesDouble Helix Fine-tuning Seat

Use guide

  • Ensure the telescope has an internal SCT thread interface before use
  • Attach the K003 adapter to the telescope’s internal thread using hand-tightening only
  • Insert a 1.25″ eyepiece into the adapter’s eyepiece interface
  • Use the Double Helix fine-tuning seat to adjust focus with 0.5 mm increments
  • Avoid over-tightening to prevent thread damage

FAQ

What telescopes is this adapter compatible with?
Telescopes with internal SCT thread interfaces, such as Celestron C8, C9.25, and CGE series.
Can I use this with a 2″ eyepiece?
No. The adapter is designed for 1.25″ eyepieces only.
Is the focusing accuracy repeatable?
Yes. The double helix mechanism ensures consistent 0.5 mm focus steps with minimal backlash.
Is this adapter suitable for astrophotography?
Yes. The high accuracy and all-metal construction make it suitable for imaging setups requiring stable focus.
What is the focusing stroke length?
10 mm, allowing for fine focus adjustments across a range of imaging conditions.

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