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OAG Off Axis Guider Astronomy Accessory Astrophotography

OAG Off Axis Guider Astronomy Accessory Astrophotography

The OAG Off Axis Guider is an astronomy accessory designed for astrophotography, enabling precise tracking during long-exposure imaging by guiding the telescope without interrupting the main imaging path. It fits standard 2-inch focuser systems and allows the use of a separate guide camera to monitor a guide star off-axis from the main imaging sensor.

  • Enables continuous astrophotography without interrupting the main imaging path
  • Uses a separate guide camera to track a guide star off-axis from the main sensor
  • Compatible with standard 2-inch focuser systems for easy integration
  • Reduces mechanical stress on the telescope by avoiding separate guide scopes
  • Improves tracking accuracy for long-exposure deep-sky imaging
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Technical features

  • Designed for 2-inch focuser systems
  • Uses off-axis guiding with a beam splitter to divert light to a guide camera
  • Supports standard guide camera interfaces (e.g., USB, USB3)
  • No moving parts in the optical path during imaging
  • Compatible with most refractors, Newtonians, and Cassegrains using 2-inch focusers

Who it is for

  • Amateur and professional astrophotographers
  • Imaging system integrators building custom telescope setups
  • Users seeking to reduce equipment bulk and complexity

Specifications

ModelOAG Off Axis Guider
Optical PathOff-axis beam splitting
MaterialAluminum alloy body
Field of View for GuideDepends on telescope focal length and guide camera sensor size

Use guide

  • Attach the OAG to the telescope’s 2-inch focuser using the standard clamp
  • Position the guide camera to receive light from the off-axis beam splitter
  • Align the guide star in the guide camera’s field of view using software
  • Start imaging while the guide camera tracks the star in real time

FAQ

What telescope focusers are compatible?
Standard 2-inch focusers. Not compatible with 1.25-inch or 3-inch systems.
Can I use any guide camera?
Yes, as long as it connects via USB or USB3 and fits the guide port on the OAG.
Does it block the main imaging path?
No. The OAG diverts a portion of light to the guide camera while allowing full imaging through the main path.
Is there a learning curve to set it up?
Basic setup requires aligning the guide star in the guide camera; software tools simplify alignment.
What is the weight of the OAG?
Approximately 250 grams.

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