Évaluations - 3, GPA: 3
(
)
)
|
Facilité d'utilisation
A light source is expressed using a color temperature (K). The bluer the light, the higher the temperature; conversely, the redder the light, the lower the temperature. The table given below shows the correlation between light sources and color temperatures. Light source Color temperature (K) Clear skies 10,000 Blue Cloudy 8,000 ‘ Rainy 7,000 Fluorescent lights (daylight) 6,000 5,000 Sunshine at midday Mercury-vapor lamps White Fluorescent lights (white) 1 hour after sunrise, 1 hour before sunset 4,000 Fluorescent lights (warm white) 3,500 Studio lights 3,200 Yellow Halogen lamps, video lights 3,000 30 minutes after sunrise, 30 minutes before sunset Incandescent bulbs 2,500 Sodium lamps (Lighting inside tunnels) Sunrise, sunset Candlelight 2,000 red 40 White balance adjustment This adjustment may be skipped when the white balance selector switch is used at the ATW position (automatic tracking wide balance mode) or PRST position (for shooting under a predetermined light source). I Set the POWER switch to ON. 2 Set the white balance selector switch to MEMO. 3 Place a sheet of white paper, handkerchief or something similar in conditions identical to those of the light sources which will be used to illuminate the subject, and zoom in on the subject so that the screen is filled with the white paper or handkerchief. • Something white (such as a piece of white fabric or white wall) near the subject may serve instead, but it should be borne in mind that what you thought was white may in fact be slightly coloured. • Be careful not to open the lens iris too far when adjusting the white balance. Attempting to adjust the white balance with the iris open too far will cause the warning ‘TOO BRIGHT’ to be displayed and processing to stop. Note that the ‘TOO BRIGHT’ warning is especially prone to appear when the entire screen is filled with something white, such as a piece of paper. (Generally speaking, selecting the AUTO IRIS mode to control the lens iris setting will ensure that it is automatically adjusted to the appropriate setting for the lighting level.) 41 4 Shoot the white object so that it fills the screen, and set the AUTO W/B BAL switch to AWB. f \ AUTO W/B BAL 0 -AWB ^ v J How to use the automatic tracking white (ATW) balance mode The automatic tracking white balance mode is established when the white balance selector switch (AUTO W/B BAL) is set to the ATW position. However, since the ambient light conditions may make the auto tracking white balance operation unstable, learn how to use the MEMO, PRESET and ATW modes to best suit the prevailing conditions. Examples • When shooting a subject illuminated by a spotlight, proceed in the PRESET (INDOOR mode). • If you know ahead of time that you will be shooting a subject outdoors, store the white balance setting in the MEMO position. • Shooting a subject illuminated by a mixture of light from fluorescent lighting and incandescent bulbs or by a mixture of outdoor light and fluorescent lighting because the subject is by a window presents difficulties for automatic tracking. Under conditions such as these, adjust the white balance manually. Use the ATW balance mode only in an emergency when you do not have the time to adjust the white balance manually. The white balance adjustment is completed is about 10 seconds. • Upon completion of the adjustment, the color temperature display appears in the viewfinder. Now check that the color temperature imaged and the color temperature displayed in the viewfinder match. If they do not tally, it is recommended that the white balance be adjusted again. • If it was not possible to adjust the white balance, the WHITE BAL ERROR TRY AGAIN message appears in the viewfinder. In a case like this, check that the lens cable is connected properly and that the subject brightness is suitable, and then adjust the white balance again. When the white balance should be re-adjusted: Be absolutely sure to re-adjust the white balance when there has been a change in the light conditions or when the gain setting has been changed. Notes: ■ Since hunting may occur when a zoom lens with an automatic iris mechanism is used, adjust the iris gain knob provided on the lens. For further details, refer to the operating instructions accompanying the lens._ ■ The white balance cannot be adjusted if the white balance selector switch is set to the ATW or PRST position. ■ Do not allow a subject lighter than the white object shot in step 3 above onto the screen since the white balance is adjusted with the lightest part of the subject on the screen taken to be white. Failure to heed this caution may cause malfunctioning. ■ Do not increase the gain to an unnecessarily high value and then proceed with the automatic white balance (AWB) operation. Failure to heed this caution will cause the iris to be nearly stopped down when AWB is performed so operation will become unstable. Rema...