SP-5000M-PMCL / SP-5000C-PMCL
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8.9.1 About P-Iris
New Spark Series SP-5000M-PMCL and SP-5000C-PMCL 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).
8.9.2 Setting for P-iris lens being used
P-iris lens uses an absolute setting value control system and therefore, if the following
parameters are input, precise iris position control is possible.
8.9.2.1 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.
P-Iris lens select
Description
Control step number Open F value
TBD
8.9.2.2 Step max.
The iris control step depends on the lens. This setting uses the value stored in the camera.
8.9.2.3 Position
The iris position can be set between 0 to Step max. 0 means to open the iris and step max is
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 a lens is selected in the P-Iris select list
3) If the lens selection is changed in the P-iris lens select list
8.9.2.4 Current F value
The current F value is indicated by using iris position information based on commands sent from
the camera to the P-iris lens during auto-iris operation.
The relationship between iris position and F value depends on the lens used.
8.9.2.5 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 opens and Auto min. sets the limit when the iris closes. Auto max. can be
set to fully open but Auto min. is stopped at F5.6 as lens performance typically begins to
degrade if the iris closes past this point.
8.9.3 Motorized lens
The SP-5000M-PMCL and SP-5000C-PMCL can use a motorized lens for zoom, focus and iris.
The following functions are available to control the lens via the 10-pin AUX connector.
8.9.3.1 Iris
Open: While this command is being sent, the iris continues to open.
Close: While this command is being sent, the iris continues to close.
Stop: When this command is supplied, the iris operation stops.
