Handheld Shutter
Compute safe handheld shutter = 1 / equivalent focal length (s).
Input Data
Input Equivalent focal.
mm
Input IS stops.
Results
0.02s
50
Shutter = 1/(focal·2^IS).
At a glance:Handheld Shutter: enter parameters to compute results; complements related calculators.
Formula
Safe shutter = 1 / (equiv focal × 2^IS stops).
How to Use
- Enter equiv focal, IS stops.
- It returns safe shutter and 1/x.
Case Studies
50mm → 1/50s
3 IS stops allow ~1/400s equiv.
FAQ
Rule?
Reciprocal rule: shutter no slower than 1/focal to avoid shake.
Related Tools
References
Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.