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
•When using a zoom lens, use the
•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
◆Calculating the flash effective distance according to the
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
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
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: |
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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).
88 | 89 |