Why zoom needs a faster shutter speed
Small hand movements become more visible at a narrow field of view. The traditional handheld guideline starts around one divided by the full-frame equivalent focal length. A 120mm equivalent view therefore begins near 1/120 second before stabilization or subject movement is considered.
Stabilization and motion solve different problems
Optical or electronic stabilization can reduce blur caused by the camera moving. It does not freeze a bird, aircraft or person moving through the scene. For motion, choose a faster speed even when stabilization is strong.
Improve the real result
- Brace the phone against a stable surface or use a tripod.
- Use a timer or gentle shutter press to reduce movement.
- Check detail at full size and adjust for light, wind and subject speed.