Olympus E-3 사용자 설명서 - 페이지 7

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Differences between photography

on dry land and under water

Light

Because part of the light beams are reflected

when they hit the water's surface, less light is

available underwater than on dry land. The lower

the angle at which they hit – such as during early

morning or late afternoon – and the rougher the

water surface, the more the light beams will be

reflected. Best results are therefore achieved

during calm seas and around noontime when

the sun is at its highest. Also, don't forget that

due to the density of water, the deeper you go,

the darker it gets – right up to the point of

complete darkness.

Colours

The further light travels down in the water, the

more colours of the spectrum get lost. This starts

with colours that have long wavelengths (red at

The altered conditions

underwater make distances

appear shorter by a fourth.

This means something that

seems like it is 3m away is

actually 4m away. Remember

to take this into account

when using the flash under-

water and judging the

distance to the subject.

a depth of around 3 – 5m)

and proceeds to colours with

short wavelengths (blue at

a depth of around 20m).

The loss of colours not only

happens vertically, but also

horizontally. So if you are

taking a photo of a red

subject from a distance of

over 5m – even if you are

close to the surface – the red

colour will be completely washed out. Bear in

mind that if using the flash, the light must travel

to the subject and back, thereby effectively

halving the maximum distance.

Particles

Water is more or less full of floating particles.

The amount of these depends on various factors

including how clean the body of water is, the

time of year and the current or turbulences at

a given time. The particles are generally larger

than those present in the air and are therefore

more likely to have an effect on the outcome of

shots. Most common effects are reduced contrast

and clarity (dots showing

up in the photo) as well as

a decrease in the available

light, as the floating particles

also diffract light beams.

General tips:

• If possible, go diving in

clear weather

• Bear in mind the filtering

effect on colours as

distance increases

• Make use of your camera's

exposure bracketing

function (if available)

• It is often indispensable

to use a flash