Observe
Describe the exact failure, preserve the image, log, error text, equipment state, and timing before a restart removes useful evidence.
DEEP-SKY ASTROPHOTOGRAPHY
Deep-Sky Astrophotography Troubleshooting Guides
Start with what the rig actually did, choose a test that separates possible causes, then change the smallest relevant part of the system and verify the result.
Troubleshoot the symptom, not the setting
The same visible failure can come from several layers of an imaging system. Work from evidence toward a cause instead of changing several parameters at once.
Test
Choose one action that separates likely causes: compare exposure lengths, command the mount deliberately, inspect the failed solve image, or simplify a connection path.
Isolate
Work from physical setup and power through communication, device state, configuration, operation, automation, and the final result.
Verify
Repeat the operation that failed. A restart, a success message, or a better-looking graph is not proof until the representative result also works.
FREE PRACTICAL GUIDES
Start with the failure you can see
These focused guides cover problems where a short discriminating test can remove several wrong explanations quickly.
ASTROPHOTOGRAPHY
Trailing Stars: Is It Guiding, Tracking, Flexure or Optics?
Do not assume elongated stars are a guiding problem. First decide whether the pattern is movement at all, then use exposure length, frame position, guide data, axis direction, and event timing to isolate the likely failure family.
Read the guideASTROPHOTOGRAPHY
Plate Solving Fails: Check the Image Before the Solver
A plate solver can fail because the image is not sufficiently solvable or because the solver is working from bad assumptions. Inspect the actual exposure first, then use a blind solve and configuration checks to separate those two families.
Read the guideASTROPHOTOGRAPHY
Autofocus Fails: Diagnose Stars, Focuser Motion and the Focus Curve
Autofocus is a chain of camera exposures, star measurements, focuser movements, curve fitting, return motion, and verification. Find the first stage that fails instead of assuming the focuser or algorithm is broken.
Read the guideASTROPHOTOGRAPHY
Meridian Flip Fails: Find the First Broken Stage in the Automation Chain
An automated meridian flip is a chain of state transitions, not one command. Test it under supervision, identify the last successful stage, and diagnose the first broken transition instead of changing the whole sequence.
Read the guideASTROPHOTOGRAPHY
Flats Make the Image Worse: Diagnose Calibration Before Processing Around It
A flat is a measurement of a particular optical configuration, not a generic image-improvement frame. Identify the first calibration stage that introduces the artifact, then verify geometry, illumination, exposure, and zero-level treatment.
Read the guideFULL SYSTEM REFERENCE
Deep-Sky Astrophotography Troubleshooting
The book extends the same method across guiding and tracking, pointing and automation, focus and optical failures, calibration frames, device communication, clear-night recovery, known-good baselines, and a quick diagnostic reference.
Before unattended automation. Test the actual mount clearances, cable path, plate solving, guiding, autofocus, dithering, meridian-flip behavior, and safe park or shutdown behavior under supervision before relying on the complete sequence unattended.