Sony SRW-9000 Operation Manual page 48

Setting Value
W:P Preset value (3200K)
W:A The value stored in memory A
W:B The value stored in memory B
For details on white balance adjustment, see
"Adjusting the White Balance (in Custom Mode)"
(page 55).
Gain switch values (L/M/H) page
You can use the gain switch of the RM-B150
Remote Control Unit to switch the gain of this
unit's video amplifier. You can also assign gain
functions to assignable buttons 1 to 3, 5 to 8, N,
and C. Before doing so, you need to set a gain
value for each position (L/M/H). You can set
these values on this page. This page also allows
you to switch the gain of this unit's video
amplifier between the L, M, and H values.
Note
To adjust the gain, you can either select it directly or
switch between the L, M, and H values. If you set it
directly, it may differ from the L, M, and H values, in
which case the unit displays L*, M*, and H* with
asterisks to indicate that the gain value is different from
the values assigned to L, M, and H.
Immediately after you power the unit on, GAIN is
always displayed as "**", to indicate that the gain switch
position is undetermined. At this time, the gain is most
recent gain value from the last time you used the unit.
(The unit assumes that the position is undetermined
because you may have powered the unit off with L*, M*,
and H* displayed.)
When GAIN is displayed as "**", and you switch it with
the assignable buttons or a subdisplay operation, the unit
always selects L first.
You can make the same settings on the <GAIN
ASSIGN> page of the Camera >OPERATION
menu (see page 127).
ISO sensitivity and dynamic range
indications
The ISO sensitivity value displayed on the Gain
setting page is defined as "the value at which the
video input becomes 20% when shooting a gray
scale chart with a 18% reflection rate".
48 Basic Settings with the Subdisplay
Note that the video output value with respect to
this input will vary depending on the selected
gamma.
Dynamic ranges are displayed as percentage
values. They show the high luminance limit for
the case where grayscale white output is 100%
(700 mV), with ITU-R709 gamma (standard
gamma) and the input level as 100%.
Latitude values are displayed with E, showing the
latitude on the high luminance side as an f-stop
value, using a gray-scale chart with an 18%
reflection rate as the key light Gradations on the
low luminance side can be expressed up to
approximately –6.5 stop at 0 dB.
Note
As the dynamic range indication shows a value for the
input video, the dynamic range of the output video is
limited by the output settings as follows:
If a gamma other than S-LOG is selected
The upper limit is clipped according to the output
video limitation specified by the gamma setting.
When you select a curve as Hyper Gamma No. 4,
which compresses 460% input to 109%, the
output video is fed within the range up to 460% of
input video even if 800% is displayed on the
subdisplay as the dynamic range as the output
video is limited to 109%.
Using CvpFileEditor V4.0 (see page 74), you can
change the dynamic range of Hyper Gamma and
create a user gamma curve having no dynamic
range limitation.
If the white clip function is in use
As the white clip function limits the level of
output video, the dynamic range specified for the
input video may not be obtained for video output.
When you select "gain compensation mode" as
the video level compensation mode for the
Select FPS function
The dynamic range value declines up to a
1
maximum of / , depending on the FPS setting
2
(number of frames to shoot).
Memo
Why the ISO sensitivity is defined for 20%
input
Defining the level of gray scale of 18% reflection rate for
the ISO sensitivity on the linear curve (defining with
input signal) permits you to use the values as the absolute
reference for proper gamma conversion in
postproduction.