Handleiding Panasonic NVMX300B (pagina 57 van 61) (Engels)

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Miscellaneous/

Care of Unit/Options

112

∫ White Balance Adjustment

While most recording with a Movie Camera is

probably done outdoors under sunlight, video

recording is also done very often under artificial

light sources, both indoors and outdoors.

However, each of these light sources gives the

subject slightly different colours.

Human Eyes

Human eyes can easily adjust to different kinds of

lighting and see an object with the same colours

even under different lighting.

Movie Camera

Unlike human eyes, the Movie Camera does not

have the innate ability to adapt to changes in

lighting, and they influence the colours being

recorded. Therefore, depending on the light

source, the picture would be recorded with a

bluish or reddish tint. To minimise the influence of

the lighting on the colours of the subject, an

adjustment called White Balance Adjustment is

necessary.

White Balance Adjustment

The White Balance Adjustment determines the

colour of the light and adjusts the colours so that

white remains pure white. As white is the basic

colour of the entire colour spectrum, if white is

reproduced correctly, the other colours are correct

and natural, too.

Auto White Balance Adjustment

This Movie Camera stores the optimum settings

for several common light sources in memory. The

Movie Camera judges the recording situation by

determining the tint of the light received through

the lens and by the White Balance Sensor (p. 5),

and it selects the setting for the most similar tint.

This function is called Auto White Balance

Adjustment.

However, as the white balance settings for only a

few light sources are stored in memory, the white

balance is not correctly adjusted for other lighting

conditions.

For the range of different types of lighting within

which the Auto White Balance Function can

provide precise adjustment, refer to the chart. For

recording under lighting conditions outside this

range, the Auto White Balance Function does not

work correctly, and the recorded picture has a red

or blue cast. However, the same also applies, if

the subject is lit by more than one light source,

even if these light sources are within this range.

∫ Colour Temperature

Every light source has its own colour temperature

measured in Kelvin (K). The higher the Kelvin

value, the more bluish the light; the lower the

value, the more reddish the light. The Kelvin value

is related to the tint of the light, however not

directly to its brightness.

The range

1 indicated in the illustration below

shows the light sources for which this Movie

Camera can provide precise white balance

adjustment and, therefore, natural colours in the

recorded pictures, when using the Full Auto Mode.

For light sources outside this range, adjust the

white balance manually. (p. 60) Also, additional

lighting may be necessary.

1 Control range of this Movie Camera’s Auto

White Balance Adjustment Mode

2 Blue sky

3 Cloudy sky (Rain)

4 TV screen

5 Sunlight

6 White fluorescent lamp

7 2 hours after sunrise or before sunset

8 1 hour after sunrise or before sunset

9 Halogen light bulb

: Incandescent light bulb

; Sunrise or sunset

< Candlelight

10 000K

9 000K

8 000K

7 000K

6 000K

5 000K

4 000K

3 000K

2 000K

1 000K

Glossary

∫ Focus

If you look at an object through a magnifying glass

and move it closer or further away from your eye,

you will reach a point where the object becomes

clearly visible. Being focused or in focus means

that the subject can be seen with optimum clarity

and sharpness.

Human Eyes

Human eyes have lenses as well, and when we

look at objects at different distances, the shape of

these lenses changes automatically so that we

can always see these objects clearly.

Movie Camera

The image of the subject enters the Movie Camera

through the lens and is converted into an electric

signal (video signal) for recording onto magnetic

tape. The focus is adjusted either manually or

automatically by moving a focusing lens.

Auto Focus Adjustment

The Auto Focus System automatically moves the

internal focusing lens forward or backward and

adjusts the focus so that the subject can be seen

clearly.

The Auto Focus Adjustment has the following

characteristics:

≥It adjusts until the vertical contours of the subject

are as sharp and clean as possible.

≥It adjusts the focus on the subjects with strong

contrast.

≥It adjusts the focus on the subject in the centre of

the LCD Monitor or Viewfinder.

Unlike human eyes, the lens of the Movie

Camera cannot instantaneously change the

focus from a nearby to a distant subject and vice

versa.

Lens Unit

The lens construction used in this Movie Camera

generates some clicking noise if the Movie

Camera is rocked up and down while it is turned

off. This is not a malfunction of the lens unit. This

noise does not occur when the Movie Camera is

turned on.

For the following subjects and recording

situations, the Auto Focus system cannot

provide precise adjustment. Use the Manual

Focus Mode instead. (p. 28)

1 Recording subjects with a part of it near the

Movie Camera and another part far away

from it

As the Auto Focus adjusts on the centre part of

the image, it is often impossible to bring the

nearby and distant parts of the subject into

focus.

When you want to record a person with a

distant mountain in the back, it is not possible

to focus on both.

2 Recording subjects behind glass covered

with dirt or dust

As the focus is adjusted on the dirty glass, the

subject behind the glass is out of focus. When

recording a subject across a street on which

cars are running, the focus may be adjusted on

the cars.

3 Recording subjects in dark surroundings

As the amount of light information entering

through the lens is greatly reduced, the Movie

Camera cannot adjust the focus precisely.

4 Recording subjects surrounded by objects

with shiny surfaces or much light reflection

As the Movie Camera adjusts the focus on

objects with shiny surfaces or much light

reflection, the subject may go out of focus.

Therefore, when recording at a lake or the sea,

evening scenes, fireworks, or under special

types of lighting, the subject may be out of

focus.

5 Recording fast-moving subjects

As the internal focusing lens is moved

mechanically, it cannot follow fast-moving

subjects without delay.

Therefore, subjects like children running back

and forth may temporarily go out of focus.

6 Subjects with weak contrast

As the Movie Camera adjusts the focus based

on vertical contours in the picture, subjects with

little contrast such as a white wall may be out of

focus.

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