Manual flash and power ratios using a speedlight.

1. Speedlight Basics:
Guide Numbers, Calibration and Application
Power Ratios
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 1

2. Speedlight Basics:
Power Ratios
Power Ratios control the amount of power that your flash
unit delivers when you are shooting in manual flash mode.
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 2

3. Speedlight Basics:
Power Ratios
Power Ratios are expressed as fractions:
1/1 = full power
1/2 = half power
1/4 = quarter power
1/8 = eighth power
1/16 = _________?
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 3

4. Speedlight Basics:
Power Ratios
Power Ratios are expressed as fractions:
1/1 = full power
1/2 = half power one stop less power
1/4 = quarter power two stops less power
1/8 = eighth power three stops less power
1/16 = sixteenth power ___________?
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 4

5. Speedlight Basics:
Power Ratios
Power Ratios are useful for:
Developing Lighting Ratios
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 5

6. Speedlight Basics:
Power Ratios
Conserving Battery Power
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 6

7. Speedlight Basics:
Power Ratios
Reducing Recycle Time
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 7

8. Speedlight Basics:
Power Ratios
Controlling Depth of Field
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 8

9. Speedlight Basics:
Power Ratios
Working in a Small Space
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 9

10. Speedlight Basics:
Power Ratios
Developing Lighting Ratios
Michael E. Stern
Photographer Educator Radio Host Author
818-422-0696
Build A Better Photograph Dot Com
Sunday, November 13, 2011 10

11. Speedlight Basics:
Sunday, November 13, 2011 11

12. Speedlight Basics:
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13. Speedlight Basics:
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14. Speedlight Basics:
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15. Speedlight Basics:
Sunday, November 13, 2011 15