Pentax w Digital Camera User Manual


 
89
Shooting Functions
4
Shooting portraits with a flash in a dark environment often results in eyes
looking reddish in the photograph. This phenomenon, commonly known
as “Red-Eye”, is caused by the reflection of the electronic flash in the
retina of the eye. It can be reduced by taking a picture in brighter light or
by shooting with a wider-angle lens at a closer distance. When using an
external flash, it may also help to position the flash as far away from the
camera as possible.
As a rule of thumb, the distance for using the built-in flash (which varies
with the lens used) is within about four meters of the subject. (With
sensitivity 400)
The flash recommended indicator [b] in the viewfinder and on the LCD
panel will blink to recommend that you use the flash when you attempt to
take a picture in low light and backlight condition.
About Red-eye Phenomenon
Flash photography distance
The flash effective range does not come closer than 0.7m (2.6ft), even if the
lens aperture is very small. The exposure will not be properly controlled when
taking a picture closer than 0.7m. Note that this can also cause and you will
see vignetting in the picture corners.
To calculate the flash photography distance from the aperture size, see
p.139.
Flash Recommended indicator
b will blink only in backlit conditions when the capture mode is set to b
(shutter priority) mode or a (manual exposure) mode.
b stops blinking when the flash is fully charged.
b will not appear in Bulb mode.