JVC GR-45 User Manual

SUPPLEMENTAL INFORMATION
What is "colour temperature'?
Light is composed of various colour components in
different proportions. A relationship exists between
the temperature of a light source and the colour com¬
ponents of the emitted light; as the temperature rises,
the colour of the light varies from red, orange, yellow,
white to blue in that order. "Colour temperature" is a
value that expresses differences in colour among light
sources, measured in Kelvin degrees. Bluish light has a
higher colour temperature than reddish light.
What is "white balance'?
Making the colours look natural on TV is what white
balance is all about. Because a camera is not as
adaptable as the human eye, if a light source is
reddish, white subjects in that light are recorded as
reddish. White balance adjustment is performed to
compensate for colour temperature variations of light
so that whites are reproduced as white. Correct white
balance makes all other colours correct. The GR-45E
can perform automatic white balance adjustment in
the full-auto mode. However, if illumination is
insufficient, white balance adjustment cannot be per¬
formed. To obtain correct colours, therefore, suf¬
ficient illumination is essential.
What is "illuminance'?
"Illuminance" (also called 'luminance') is the intensi¬
ty or brightness of light, expressed in lux. The GR-45E
is designed to provide best pictures under the condi¬
tions of a 700-lux illuminance, although shooting is
possible all the way down to 10 lux. To obtain good
pictures in very bright light, the use of an ND (neutral
density) filter is recommended. (See chart on this
page.)
How to get good colour pictures
The simplest way is to provide sufficient lighting
(close to the camera's reference illuminance) and
accurately adjust thecameratothecolourtemperature
of that lighting. If light sources of different colour
temperatures are used together, accurate white balance
adjustment is very difficult. For example, if natural
light is mixed with artificial light, which is likely to
occur next to windows, correct colours of the subject
are difficult to obtain. It is recommended in such
cases that curtains in the room be closed to shut out
light from outside. Also, when artificial lighting
devices are used, they should all have the same colour
temperature. For example, it is recommended that
incandescent or halogen lamps not be used together
with fluorescent lighting.
C,our tamperaturo* of ..*>»-r.W icialMgh^
OlOlir _ __
Type of illumination
Colour
temperature
2800 K __
Tungsten lamp for home use
Tungsten lamp for photographic use
3200 K
Quartz-halogen lamp
_
Blue lamo for photographic use
5000 K
Warm white
3500 K
Fluorescent lamp
White
4500 K
Daylight type
6500 K
Illuminance chart
•The values on this chart are approximated to give
you a rough reference.
Unit: Lux
1
1
100,000-
• Clear sky, mid-day, under sunlight
Q
Z
(100.000)
• Clear sky (10:00 a.m.) under
sunlight (65,000)
• Clear sky (3:00 p.m.) under
sunlight (35,000)
• Cloudy sky (mid-day) under
sunlight (32.000)
• Cloudy sky (10:00 a.m.) under
sunlight (25,000)
0)
3
10,000-
I
I
• By the window during the
afternoon (3.500)
2
2,000-
• Cloudy sky (one hour after
cc sunrise) (2,000)
1,000-1
• Clear sky (one hour before
sunset) (1,000)
600-
• Counters at department stores
(500 - 700)
500-
• Bowling center (500)
• Office under fluorescent light
(400 - 500)
• Library (400 - 500)
• Direct light of a flashlight at 1 m
distance (250)
?
100-
• Streetlight at night
(150-200)
80-
1
Minimum
« ■ *
lighting for
O)
□
an object
15
• Cigarette lighter
(at a distance of 30 cm)
(15)
10
- •Candlelight
(at a distance of 20 cm)
(10- 15)

JVC GR-45 Specifications

General

Brand	JVC
Model	GR-45
Category	Camcorder
Language	English