Sharp and Smeared Runner

In the picture

1. 1Sharp runner’s chest: the runner is caught in a single clear instant
2. 2Blurred runner trail’s trailing leg: the movement is spread into a long smear
3. 3Narrow gap between shutter curtains: a small opening lets light in briefly
4. 4Camera’s front lens glass: the opening where light from the track enters

Examples

• A photo of a flying bird can be sharp or blurred depending on how long the camera collects light.
• A car passing at night can appear as a long streak in a photograph.

Quiz: Sharp and Smeared Runner (Age 12)

1. 1

   Which sentence matches a short exposure time?

   • It can keep the shutter opening wide for a long time.
   • It can make a moving person look sharp.
   • It can turn movement into a blurred trail.
2. 2

   Which sentence matches a long exposure time?

   • It can make a moving person look sharp.
   • It lets light in only for a brief instant.
   • It can turn movement into a blurred trail.
3. 3

   What does the narrow gap between the shutter curtains do?

   • It stops all light from reaching the lens.
   • It lets light in briefly.
   • It lets light in for a long time.

The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.