| EI |
Guide Numbers for 4-6 Inch Polished Reflector
For satin reflector open 1/2 stop.
For doors, open 1 stop.
For close indoor spaces, close 1 stop.
|
| <=1/25 |
1/50 |
1/100 |
1/200 |
1/400 |
| 16 |
110 | 95 | 80 | 70 | 55 |
| 20 |
120 | 110 | 90 | 80 | 65 |
| 25 |
130 | 120 | 100 | 90 | 70 |
| 32 |
150 | 130 | 120 | 100 | 80 |
| 40-64 |
190 | 170 | 150 | 120 | 100 |
| 80-125 |
260 | 240 | 200 | 180 | 140 |
| 160-250 |
380 | 340 | 300 | 240 | 200 |
| 500-800 |
650 | 600 | 500 | 440 | 360 |
|
