Pentax MZ-6 manual For near distances 3.9÷5 = approx, Memo Reducing Red Eye

MZ-6(E)05 E1/085-094 11/8/02 12:06 PM Page 88

Memo Reducing Red Eye

Red eye occurs in flash pictures when the flash reflects off the eye’s reti- na. Although red eye cannot be totally prevented, it can be reduced by the following methods:

•Take the picture in a well-lit place.

•When using a zoom lens, use the wide-angle end and a close distance.

•If you are using an external flash unit, keep it apart from the camera lens as far as possible.

ADVANCED TECHNIQUES WITH THE BUILT-IN FLASH

This section explains how to calculate the built-in flash’s effective range and the compatibility with F and FA lenses.

◆Calculating the flash effective distance according to the camera-to-subject distance.

Calculate the effective flash range as follows:

For far distances Guide No. ÷ Current aperture

For near distances Far distance result ÷ 5*1

*1: This formula using “5” as the divider applies only to the built-in flash.

Memo

The flash cannot be used at distances shorter than 0.7 m. Doing so will result in irregular or obstructed flash coverage and flash overexposure.

USING THE BUILT-IN FLASH

The Guide No. will be as follows depending on the ISO film speed.

ISO Film Speed Guide No.

ISO255.5

ISO507.8

ISO10011

ISO20015.6

ISO40022

With ISO 100 film and an f/2.8 aperture, calculate the	STEP
effective flash range as follows:
	UP
For far distances Guide No. 11 ÷ f/2.8 = approx. 3.9 m
	FLASH
For near distances 3.9÷5 = approx. 0.8
The effective flash range is therefore approx. 0.9 m - 4.3 m.	PHOTOGRAPHY
Guide No. ÷ flash range = Flash aperture
Calculating the flash aperture from the effective flash
Memo range
Use the effective flash range to calculate the flash aperture as follows:

If the result is a number (such as 3) that is not a lens aperture value, set it to the next smaller aperture value (2.8).

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