How much will this motion actually displace on my sensor?

Answer

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Motion blur is a displacement question

Motion blur is a displacement question. A longer shutter, faster image movement, longer focal length, and smaller pixels can all make the same motion span more of the final image. The number is most useful as a starting point for an intentional test, because subject path, panning, stabilization, focus, processing, and delivery size still shape what looks acceptable.

With a 100mm lens, a stated 10-degree-per-second angular motion, 1/250 second, and 4-micrometre pixels, the small-angle approximation gives a starting pixel displacement. Halving shutter time halves the result. That does not tell you whether the frame looks "sharp"; it shows why a faster shutter or shorter focal length may be necessary when you want to reduce visible movement. Make a bracket and inspect the actual critical detail.

This result models the values you entered. It cannot see the scene, verify focus or movement, predict camera-specific processing, or guarantee the final photograph. Use it as a stated starting point, then check the important subject area in a test frame or proof.

Make one controlled test with the important variable held constant. Inspect the subject detail, motion, highlights, and intended output, then adjust the setting that protects the priority you named.

FAQ

What shutter speed freezes action?

There is no universal value. It depends on image motion, focal length, output size, subject path, and the blur you accept.

Is this a guarantee?

No. The result is bounded by the inputs and assumptions shown on the page. It is designed to support a better next decision, not replace a test, measurement, proof, or professional judgement where one is needed.

Next decisions

• Next decisionVideo Exposure Triangle Planner
• Check it against a real imageLocal Sharpness and Motion Diagnostic
• CompareElectronic-Shutter Readout and Motion Planner