Pentax 540FGZ - AF - Hot-shoe clip-on Flash Operating Manual page 26

Auto zoom electronic flash unit
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● In the (A.Zoom) mode, the flash coverage angle
will be adjusted automatically to suit the lens
focal length when you press the shutter release
button halfway, and the camera exposure
metering timer is on.
● A warning signal appears as follows when the
flash cannot cover the focal length of the
camera.
- The zoom indicator blinks for the combination of
the following camera and lenses.
Camera
*ist D series
35mm autofocus single
lens reflex cameras
645N2, 645N
- The warning signal does not appear for the
combination of the following cameras and focal
lengths.
Camera
*ist, MZ-L/ZX-L/MZ-6,
MZ-S
*ist DL, *ist DS, *ist D
24
Lens Types
DA, D FA, FA J, FA, F
D FA, FA J, FA, F
FA645
Focal length
20 mm and over, less
than 24 mm
13 mm and over, less
than 16 mm
● In the (A.Zoom) mode, if there is no lens focal
length information, the flash coverage angle will
be set automatically to 24mm with a 35mm
camera. With a 645 camera, it will be set to
45mm, with a 67 camera it will be 60mm, and with
a digital camera it will be 16 mm.
● When using the wide-angle panel, the angle will
be fixed at 20 mm for a 35 mm camera, 35 mm for
a 645 camera, 55 mm for a 67 camera, and 13 mm
for a digital camera in both A.Zoom and M.Zoom.

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