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Lightning <ul><li>Atmospheric discharge of electricity.
Often accompanied by thunder.
Travels at 60,000 m/s
30,000 °C (54,000 °F) </li></ul>
Photographing Lightning A tricky problem: <ul><li>Hard to predict.
Over pretty quickly.
Cameras can get wet. </li></ul>
 
Approaches using CHDK Free Software (CHDK) offers two approaches: <ul><li>The old way: “Wait and hope.”
The new way: Motion detection. </li></ul>
Wait and Hope <ul><li>Using a CHDK intervalometer script to take long-exposure shots repeatedly.
1-15 second exposures (1-second can work better for lightning) can keep shutter open between 80-95% of the time.
“Dark frame subtraction” addresses noise from long exposures.
Tends to work poorly during the day. </li></ul>http://chdk.wikia.com/wiki/UBASIC/Scripts:_OMNI_Intervalometer
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Mako lightning talk

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Mako lightning talk

  1. 1. Lightning <ul><li>Atmospheric discharge of electricity.
  2. 2. Often accompanied by thunder.
  3. 3. Travels at 60,000 m/s
  4. 4. 30,000 °C (54,000 °F) </li></ul>
  5. 5. Photographing Lightning A tricky problem: <ul><li>Hard to predict.
  6. 6. Over pretty quickly.
  7. 7. Cameras can get wet. </li></ul>
  8. 9. Approaches using CHDK Free Software (CHDK) offers two approaches: <ul><li>The old way: “Wait and hope.”
  9. 10. The new way: Motion detection. </li></ul>
  10. 11. Wait and Hope <ul><li>Using a CHDK intervalometer script to take long-exposure shots repeatedly.
  11. 12. 1-15 second exposures (1-second can work better for lightning) can keep shutter open between 80-95% of the time.
  12. 13. “Dark frame subtraction” addresses noise from long exposures.
  13. 14. Tends to work poorly during the day. </li></ul>http://chdk.wikia.com/wiki/UBASIC/Scripts:_OMNI_Intervalometer
  14. 15. Motion Detection <ul><li>A user named “MX3” wrote motion detection functionality for CHDK using variance in luminance.
  15. 16. Triggered by the “lead” strike which immediately precedes every main lightning strike.
  16. 17. Every photograph on camera has a lightning strike.
  17. 18. Works in daylight or even without tripod. </li></ul>

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