Science · 6 pages · 12 min
Why a longer shutter changes blur
The shutter is a duration, so whatever moves while it is open lands in more than one place.
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From the opening
A longer shutter changes blur because the sensor keeps adding light the whole time it is open. A point that stays put piles up in one place, and a point that moves is written as a streak along its path. The opening covers the sensor adds every position, why a tripod still shows the subject, and a flash can be shorter than the dial.
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Inside
- The sensor adds every position
- Why a tripod still shows the subject
- A flash can be shorter than the dial
- Panning hands the streak to the background
- Where the idea stops applying
- A distinction worth keeping
Sources
- Exposure as an integral of a moving image
- Motion blur from relative travel during the shutter time