Shutter Timing and Flash Synchronization System

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Shutter Timing and Flash Synchronization System

• Joel Hoffa
• Shaun Pontsler
• Advisor Prof. Herr
• May 4, 2005

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Why are Shutter Speeds Important?

• In combination with other controls, it allows a
  photographer to produce certain effects.
• Exposure
• Motion Blur
• If a shutter can be proven reliable, it is worth
  more to potential buyers.

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Exposure

• Top 1/1000th
• Middle 1/500th
• Bottom 1/250th

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Motion Blur

• Left 1/1000th
• Right 1/125th

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Depth of Field

• Left 1/250th
• Right 1/1000th

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Why is Verifying Shutter Speed Desirable?

• EBay currently lists 16,000 film cameras.
• Listings state camera condition.
• ? Condition is determined by shutter sound.
• ? Good condition cameras are worth more.
• ? Best way to show this is to produce data that
  confirms accurate shutter speed.

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Project Requirements

• Accurate and precise timing (1 ms 100s)
• Portable
• Compact Design
• Able to be used on the go
• Versatile
• Test a wide range of camera sizes
• From all eras

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Hardware Block Diagram
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Prototype Enclosure
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Prototype Test Stand
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Testing Results
Camera Panorama Camera Panorama Camera Panorama Camera Panorama
Test Number Shutter Time Equivalent Setting Oscilloscope Time
1 7ms 143th 6.5ms
2 7ms 143th 6.6ms
3 8ms 125th 7.5ms
4 8ms 125th 8.1ms
5 7ms 143th 7.0ms
6 8ms 125th 7.8ms
Camera Optical Lens 35mm Camera Optical Lens 35mm Camera Optical Lens 35mm Camera Optical Lens 35mm
1 7ms 143th 7.0ms
2 8ms 125th 7.5ms
3 8ms 125th 7.6ms
4 8ms 125th 7.5ms
5 7ms 143th 6.8ms
6 7ms 143th 6.9ms
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Man Hour Budget

• Projected Hours
• 396 Hours
• Estimated Hours
• 290 Hours (Split shown by chart)
• At 25/hour
• Planned 9,900
• Used 7,250
• 73

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Budget Comparison
Component Type Budgeted Amount Actual Amount Difference
Microcontroller 100.00 97.00 3.00
Serial Display 55.00 69.00 (14.00)
Light Source 20.00 15.55 4.45
Photo Sensor 20.00 15.55 4.45
Miscellaneous Parts 30.00 64.15 (34.15)
Power Supply 30.00 0 30.00
Enclosure 20.00 30.72 (10.72)
Totals 275.00 291.97 (16.97)
? Main discrepancy between budgeted and actual
came from the enclosure and the interface. ? Only
6 over predicted budget.
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Conclusion

• Met requirements
• Accurate and precise oscilloscope verified
  499.83 Hz vs. 500 Hz theoretical
• Measures 1 ms to 17 minutes
• Portable Small, can be powered by a 9V battery
• Versatile Test stand can accommodate a wide
  range of camera sizes
• Stayed within budget
• Delivered on time

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Thank You for Your Time

• Questions?