Astrophotography defect gallery

Understanding the Diagnostic Gallery

This gallery brings together all public diagnostics shared on DocStellar since its launch. Each entry is a real astrophotography image, submitted by a community member or the team, and examined by the Doc. You will find everything from raw frames straight out of the sensor to master frames after stacking and final images after processing.

What you will find

• Cases of elongated stars caused by sensor tilt, incorrect backfocus, or uncorrected coma.
• Light gradients from urban pollution, moonlight, or a failed flat.
• Noise in all its forms: walking noise, FPN, banding, amp glow.
• Rarer defects: chromatic halos, clipping, shadow noise, and more.

The filters on the left let you cross-reference the image type (raw / master / processed) with the defect family and severity. To dig into a specific case, click the thumbnail: you get the fully annotated image, the list of identified defects, and detailed guidance on what to do next.

Want to add your own image? Submit it — every diagnostic enriches the corpus.