How Long Should an Exposure Be?

How do source counts, background, read noise, frame count, and saturation determine a useful plan?

Build an auditable signal-to-noise forecast, then reject plans that overflow the detector or ignore repeated read noise.

A telescope feeds a detector while several short exposure frames combine into a cleaner spectrum without overflowing the detector. — Vastward artistic reconstruction of exposure planning, stacking, noise, and detector saturation.

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