Brightness; Gain; Shutter - Sony XCD-SX910CR/X710CR Technical Manual

Brightness

This camera supports brightness control. This makes
fine adjustment of the black level possible. (The
former model, XCD-SX910/X710 (firmware version
1.07) does not support brightness control.)

Gain

Both Manual and Auto Gain setting are available with
this camera.
The variable range extends from 0 to 18 dB (XCD-
SX910CR/X710CR)/0 to 24 dB (XCD-SX910/X710),
and the unit is designed so that the gain can be
subdivided and set to any of 640 steps.
At factory default setting, the gain is set to 0 dB.
When Auto gain is selected, the gain is adjusted
automatically, based on the brightness of the subject.
At this time, the reference level (target point) is set in
the AutoExposure register.
For details on Auto Exposure, see page 9.
The XCD-SX910CR/SX910 and XCD-X710CR/X710
are not compatible with the XCD-SX900 and XCD-
X700 in Gain settings.

Shutter

This camera allows both Manual and Auto Shutter
setting.
The variable range extends from 10 microseconds to
17.5 seconds; relative control values are indicated by a
12-bit integer, and absolute control values are
indicated using a 32-bit floating point value.
The shutter settings for the XCD-SX910CR/SX910
and XCD-X710CR/X710 are the same, but these
settings differ from some of those for the XCD-SX900
or XCD-X700.
XCD-SX910CR/X710CR
XCD-SX910/X710
Functions
The relationship between the parameter and the
exposure time is given by the following formulas.
Where
P = Parameter (003h~424h)
E = Exposure time (s)
P>=3 ~ P<=1000
2
P
E =
1000000
P>1000 ~ P<1060
E= (P-1000)*0.25 + 1
Setting examples
3 (003h) :
32 (020h) :
100 (064h) :
1000 (3E8h) :
1004 (3ECh) :
1060 (424h) :
16 s
1 s
1
10 µs
3
When Auto Shutter is selected, the exposure time is
adjusted automatically, based on the brightness of the
subject. At this time, the reference level (target point)
is set in the AutoExposure register.
For details on Auto Exposure, see page 9.
Functions
1
2
9 µ s (1/100000)
1 ms (1/1000)
10 ms (1/100)
1 s
2 s
16 s
2
1000 1060
8