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Astronomy Accessories Off Axis Guider Off-axis Star Guide for Telescope

Astronomy Accessories Off Axis Guider Off-axis Star Guide for Telescope

The 12.5mm x 12.5mm Deluxe Off-Axis Guider from Nanjing AMADA Instrument is designed for deep-sky astrophotography using refractor telescopes. It enables simultaneous imaging and guiding through a single telescope, eliminating tracking errors from separate guide scopes. The unit features a small adjustable prism that redirects a guide star into the eyepiece, ensuring the autoguider and imaging camera see identical motion for precise tracking.

  • Enables simultaneous imaging and guiding through one telescope, reducing system complexity
  • Eliminates differential flexure and mirror shift caused by separate guide scopes
  • Prism tilt adjustment with captive thumbscrew for accurate guide star alignment
  • Over 100 degrees of radial movement for easy guide star acquisition
  • Coarse and helical fine focus adjustments for precise focusing
  • Compatible with most imaging cameras including DSLRs and autoguider cameras with T-threads or 1.25" nosepiece
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Technical features

  • 12.5mm x 12.5mm optical path size for compatibility with standard refractor systems
  • Adjustable prism with captive thumbscrew for tilt correction
  • Over 100 degrees of radial adjustment for guide star positioning
  • Coarse and helical fine focus adjustments for precise focus control
  • Designed for use with autoguider cameras featuring T-threads or 1.25" nosepiece
  • Compatible with telescopes having sufficient inward focus travel
  • Single-unit design that fits into the telescope’s light path without additional hardware

Who it is for

  • Amateur and professional astrophotographers using refractor telescopes
  • Imaging labs integrating autoguiding into single-telescope workflows
  • Distributors supplying accessories for astrophotography equipment
  • Telescope integrators building stable, high-precision imaging systems

Specifications

ModelDeluxe Off-Axis Guider
Optical Path Size12.5mm x 12.5mm
Prism AdjustmentTilt with captive thumbscrew
Radial AdjustmentOver 100 degrees
Focus AdjustmentCoarse and helical fine focus
Camera CompatibilityT-thread or 1.25" nosepiece autoguider cameras
Telescope CompatibilityRefractor telescopes with sufficient inward focus travel

Use guide

  • Ensure the telescope has enough inward focus travel to accommodate the OAG
  • Mount the OAG in the telescope’s focuser and adjust the prism tilt to align the guide star
  • Use radial adjustment to position the guide star within the autoguider’s field of view
  • Fine-tune focus using the helical adjustment for sharp guide star images
  • Connect autoguider camera via T-thread or 1.25" nosepiece and begin imaging

FAQ

What is the purpose of an off-axis guider?
It allows simultaneous imaging and guiding through the same telescope, reducing tracking errors from flexure and mirror shift.
Can I use this with a DSLR camera?
Yes, as long as the DSLR uses a T-thread or 1.25" nosepiece and the telescope has sufficient inward focus travel.
Does it require special telescope focus travel?
Yes, the telescope must have enough inward focus travel to accommodate the OAG without losing focus.
How do I adjust the guide star position?
Use the over 100 degrees of radial adjustment and the captive thumbscrew to tilt the prism for alignment.
What cameras are compatible?
Autoguider cameras with T-threads or a 1.25" nosepiece are compatible.

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