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Equipment buying guides

Guiding — tracking corrections during exposure

A guide camera measures star positions while software sends small corrections to the mount. This forms a closed tracking-control loop.

Guiding helps long exposures but does not replace rigidity, polar alignment or an appropriate image scale.

Imaging camera · Guide camera · Separate guide scope · Mount and tracking corrections1234
  1. 1Imaging camera
  2. 2Guide camera
  3. 3Separate guide scope
  4. 4Mount and tracking corrections
Functional schematic, not to scale. Rays and component shapes are simplified; this is not a particular model’s optical prescription.

What is it good for?

Reducing tracking errors and enabling dithering in a compatible imaging system.

Limitations and trade-offs

It cannot fix field rotation, poor focus, bad seeing or every flexure issue. Low reported error does not guarantee round stars in the main camera.

Check before buying

  • Guide scope or OAG matched to the setup
  • Compatible camera and mount control
  • Rigid mounting and cable routing

Check mechanics and focus first. Avoid aggressive corrections that chase atmospheric turbulence.

Matching your setup

Start with mount setup and checking play. Enter the correct guide-scope or telescope focal length and camera pixel size. Calibrate according to the software and driver documentation; do not blindly copy another setup’s settings.

Judge the main camera’s images. Excellent graphs with elongated stars can indicate flexure, field rotation or an optical issue. Dithering shifts the frame between exposures and needs coordination between capture and guiding software.

Overly aggressive or frequent corrections may chase seeing. Match exposures and settings to mechanics and conditions. A more expensive guider cannot replace rigid mounting.

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Documentation and further reading
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