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• Effective flash range in Programmed Auto Flash mode
Maximum aperture {
Effective range
0.9m — 4.3mm
f/4
0.7m — 3m
f/5.6
0.7m - 2.1m
Note: The effective flash range (from the film plane to
the subject) differs depending on the maximum aperture
(the smallest f-numberl of the lens in use.
{Technical Tip] How to determine the maximum aperture
If the marking on your lens reads "SMC PENTAX-F
ZOOM 1:4—5.6 35—105," for example, it has
a maximum aperture of f/4 at the focal length of 35mm
and f/5.6 at 105mm.
Operational precautions
1. While the RTF is being charged, keep your finger off
the shutter release button.
2. RTF flash warning
When using the lenses listed below, the camera's safety
mechanism warns against use of the RTF; flash marks
in the LCD panel [
]
and viewfinder { S 1 begin to
blink when the shutter release button is lightly pressed
at the completion of flash charge. In this case, even if
the shutter release button is pressed, the RTF will not
discharge and the camera is automatically switched to
the normal shooting mode.
• Lenses with a focal length of less than 35mm.
• Lenses with a focal length of over 210mm.
• Macro lenses.
The purpose of this warning Is to prevent vignetting
at four corners of a picture due to lack of illumination
or semicircular vignetting at the bottom of a picture
due to the lens blocking the illumination path of
the RTF. Since this mechanism is activated only in
combination with F-series lenses (lenses with the
marking of SMC PENTAX-F), no warning appears In
combination with other lenses, so care is advised
when using lenses other than F-series lenses.
• 26
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