Astrophotography
Integration & Stacking
How long to shoot tonight — and how much cleaner the stack gets as the frames pile up.
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Your Plan
Sub length seconds
Number of subs
Total integration
1h 00m
Frames
120
Noise vs 1 sub
÷11.0
To double SNR
—
Signal-to-noise climbs with the square root of frame count — the gains taper as the stack grows. The marker shows your plan.
Stacking averages out random noise: signal-to-noise improves by √N for N equal sub-exposures. Doubling your hours only improves SNR by about 40% — worth knowing when you decide how long to stay out.