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SP-5000M-CXP2 / SP-5000C-CXP2
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8.8.1 About P-Iris
New Spark Series SP-5000M-CXP2 and SP-5000C-CXP2 come equipped with P-Iris control as part of
the standard lens control function. The P-Iris system is a newly developed lens control method
designed to control the iris more precisely. Especially for video cameras in surveillance applications
utilizing megapixel CCD or CMOS imagers, it becomes a very important factor to control an iris in
order to achieve the maximum camera performance. In surveillance applications, depending on
shooting conditions, resolution and depth of field are important factors. The iris is deeply related
with these factors. If the iris diaphragm is smaller, but not too small, resolution gets better and the
depth of field is also deeper. The P-Iris system controls the iris diaphragm precisely and maintains
the best image with the highest resolution and depth of field. P-Iris can also combine with gain and
electronic shutter to keep the appropriate iris position under changing lighting conditions (ALC
function).
8.8.2 Setting for P-iris lens being used
P-iris lenses use an absolute setting value control system and therefore, if the following
parameters are input, precise iris position control is possible.
8.8.2.1 P-Iris lens select
Select the lens used from the P-iris select list. At this moment, there are no 1-inch P-Iris lenses
available in the list. When P-Iris Les Select is opened, the following lenses are indicated but they
are 2/3 inch format. If they are used, the corners of the image may be vignetted.
Table – 21 P-iris lens select
P-Iris lens select
Description
Control step number
Open F value
LM16JC5MM
Kowa 16mm 2/3”
74
F1.4
LM35JC5MM
Kowa 35mm 2/3”
73
F2.0
8.8.2.2 Step max.
Iris control step depends on lens. The setting value uses the value stored in the camera.
8.8.2.3 Position
The iris position can be set between 0 to Step Max. 0 means to open the iris and Step Max
means to close the iris.
In the following conditions, the camera initializes P-iris control and acquires iris position.
1) When the camera is powered
2) When the lens is selected in P-Iris Lens Select
3) If the lens is changed in P-iris Lens Select
8.8.2.4 Current F value
The current F value is indicated by using iris position information. This can be indicated during auto
iris operation. The relation between iris position and F value depends on the lens used.
8.8.2.5 P-Iris Auto min. / P-Iris Auto max.
This function can set the control range when the iris is operated automatically. Auto max. sets the
limit when the iris goes open and Auto min. sets the limit when the iris goes closed. Auto max. can
be set to fully open but Auto min. is stopped at F5.6 as lens performance typically degrades if the
iris is closed beyond this point.