Here is the method to create a lighting ratio using an incident meter.
- Meter the fill alone and adjust the reading to an even f/stop for easy calculations. Now don’t adjust the fill!!
- Meter the main plus fill and adjust the power to achieve the difference of fill alone to main plus fill. to create the desired ratio referring to the chart below.
- If the fill alone reads f/8 and the main plus fill reads f/14 (11 2/3) you have a 3:1 ratio!
|
Stops Difference |
Lighting Ratio |
Stops Difference |
Lighting Ratio |
|
2/3 |
1.5:1 |
2 |
4:1 |
|
1 |
2:1 |
2-1/3 |
5:1 |
|
1-1/3 |
2.5:1 |
2-2/3 |
6:1 |
|
1-2/3 |
3:1 |
3 |
8:1 |
