57
3
The effective flash range will be displayed on the LCD panel of
this flash unit. Make sure that you are within the effective flash
range before taking pictures.
• The effective flash range is displayed for the following
camera and lens combinations.
• The flash effective range varies depending on ISO, lens
aperture in use, and/or the zoom position (flash coverage
angle). Keep this in mind especially when you are using
a variable aperture zoom lens.
n
Guide 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.
• Depending on the camera and lens you are using, the
effective flash range may be displayed. (Refer to page 57.)
Display of Effective Flash Range
Camera
Lens Types
K series (APS-C)
DA, D FA, FA J, FA, F, A
645D
DA645, D FA645, FA645, A645
Q series
Q Mount Lens
Aperture (F/stop) =
GN/flash-to-subject distance (m)
Effective flash range
AF360FZ_540FGZ.book Page 57 Friday, December 20, 2013 6:11 PM