Pentax 57233 manual About Red-eye Phenomenon, Red-eye Reduction Flash Function

About Red-eye Phenomenon

Shooting portraits with flash in a dark environment often causes a subject’s eyes to turn out reddish in the print. This phenomenon, commonly known as "Red-Eye", is caused by the reflection of the electronic flash in the retina of your subject’s eye. It can be reduced by taking a picture in a brighter light condition or by shooting with a wider-angle lens at a closer distance, or by employing the red-eye reduction flash feature. When using a Pentax dedicated flash unit off the camera, it may also help to position the flash as far away from the camera as possible.

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BASIC OPERATION (PREPARATION)

Red-eye Reduction Flash Function

This camera includes a red-eye reduction flash function, which reduces the red-eye phenomenon utilizing preflash. In this mode, the preflash is discharged just before the shutter is released which reduces the diameter of the pupil of the eye. Then the main flash is discharged while the pupils are smaller, which in turn reduces the red-eye effect.

✍MEMO

•If the red-eye reduction is used while the AF360FGZ or AF500FTZ, etc. is set as a slave unit or wireless, the preflash for red-eye reduction will trigger the slave unit to fire. When using a slave unit, do not use red-eye reduction.

•The red-eye reduction feature works even when an only external flash is used. See page 126.

Flash Effective Range for the Auto Picture Mode and Picture Mode

As a rule of thumb the distance for using the built-in flash (which varies with the lens used) is within about four meters (using ISO 400 film).

✍MEMO

•The flash effective range does not come closer than 0.7m (2.6ft), even if the lens aperture is very small. When a subject is shot at a distance less than 0.7m (2.6ft), the correct exposure cannot be obtained, and you will see vignetting in the picture corners.

•Note the built-in flash pops up even when the subject is far away or beyond the maximum flash effective range. See page 112 for the flash effective range.

OTHERSADVANCED OPERATIONS BASIC OPERATION (SHOOTING)