Articles
The Doc's technical guides on astrophotography: acquisition, processing, gear, theory.
Calibration Frames in Astrophotography: Darks, Offsets, and Flats Explained
Calibration frames in astrophotography: what defects darks, offsets, and flats actually fix, and the mistakes to avoid. Diagnose your image in under a minute.
05 Jun 2026#acquisition #processing
Walking Noise & FPN Banding: Understanding and Eliminating Them
Walking noise, FPN, and banding: why they appear after stacking and how to eliminate them through dithering. Run your diagnosis in 1 minute.
28 May 2026#acquisition #processing
Elongated Stars in Astrophotography: Causes and Solutions
Stars shaped like comets, rods, or arcs? Discover the causes of elongated stars in astrophotography and the method to diagnose and fix them.
21 May 2026#astrophotography #mount
How to Analyze an Astrophoto Light Frame Before Stacking
An 8-point diagnostic method for sorting your astrophoto light frames before DSS or Siril: FWHM, eccentricity, SNR, tracking, optics, sensor noise.
09 May 2026#acquisition #diagnosis
Astigmatism in astrophotography: causes, diagnosis, and solutions
Astigmatism in astrophotography is one of the most common optical aberrations. The good news: in the vast majority of cases it can be corrected.
04 May 2026#acquisition #diagnosis
Astrophotography Problems: Solutions for Successful Images
This article walks you through diagnosing your images, whether the issue is collimation, sensor tilt, autoguiding, or simply poorly taken flats
30 Apr 2026#acquisition #processing