
00_AF360FGZ.book Page 79 Tuesday, June 13, 2006 12:09 PM
nGuide Number (GN)
Guide numbers indicate flash light intensity. The larger the number, the farther you can reach with your flash. From the guide number, you can easily obtain the proper aperture setting required for an optimum exposure.
Aperture (f/stop) =
•Depending on the camera and lens you are using, the effective flash range may be displayed. (Refer to page 78.)
Guide Number Table |
|
|
|
| *With the | ||||
| Flash | Camera format |
|
| Zoom position |
|
| ||
ISO | 35mm | 85mm | 70mm | 50mm | 35mm | 28mm | 24mm | *20mm | |
light | 645 | 150mm | 135mm | 100mm | 70mm | 55mm | 45mm | *35mm | |
| intensity | 67 | 190mm | 180mm | 120mm | 90mm | 70mm | 60mm | *55mm |
|
| ||||||||
|
| DIGITAL | 58mm | 48mm | 34mm | 24mm | 19mm | 16mm | *13mm |
|
| 1/1 | 36 | 33 | 30 | 25 | 22 | 21 | 14 |
|
| 1/2 | 25 | 23 | 21 | 18 | 16 | 15 | 10 |
ISO100 |
| 1/4 | 18 | 16.5 | 15 | 12.5 | 11 | 10.5 | 7 |
| 1/8 | 12.5 | 11.5 | 10.5 | 9 | 8 | 7.5 | 5 | |
|
| ||||||||
|
| 1/16 | 9 | 8 | 7.5 | 6 | 5.5 | 5 | 3.5 |
|
| 1/32 | 6 | 5.5 | 5.4 | 4.3 | 4 | 3.6 | 2.5 |
79