CaptureBeginner

Lucky Imaging

The foundation of planetary photography - selecting only the sharpest frames from thousands captured to overcome atmospheric turbulence

How It Works

Capture high-speed video at 60-200 fps to freeze atmospheric turbulence

Software calculates D/r0 ratio (telescope aperture vs Fried parameter) to determine selection rate

Frame quality is measured using Laplacian variance or similar sharpness metrics

Typical selection: 1-10% for poor seeing, 10-30% average, 30-50% good, 50%+ excellent

At 1% selection rate, amateur telescopes can approach diffraction-limited resolution (Strehl ratio >0.8)

Selected frames are aligned using centroid or multi-point registration

Stacking averages out remaining noise while preserving sharp detail

-The D/r0 ratio determines optimal selection: larger aperture needs stricter selection in average seeing
-Pickering 7-8 seeing allows 30-50% stacking; Pickering 4-5 may need only 5-10%
-Capture 5000+ frames minimum - more frames = better selection pool
-ROI (640x480) can achieve 200+ fps vs 30fps full-frame - crucial for lucky imaging
-Short exposures (5-20ms) freeze seeing better than long exposures