Prosilica GT Technical Manual V2.4.1
68
Camera interfaces
DC-Iris lenses
The Prosilica GT standard and extended cameras operate with any standard DC-
type auto iris lens. Allied Vision tested lenses include Fujinon DV10x8SA-SA1L,
Computar HG2Z0414FC-MP, and Pentax C61227DCPS.
DC-type auto iris lenses are continuously driven by a voltage (0–3.3 V) from the
camera lens control port. This voltage level determines whether the lens opens
or closes, and is calculated based on the applicable iris camera attributes.
Operation
1.
Connect a DC-Iris lens to the camera before powering up the camera.
2.
Power up camera, and open camera control software.
3.
Set camera to live image with desired
ExposureValue
and
GainValue
attri-
butes.
4.
Set
IrisMode
=
DCIris
. Camera uses an automatic algorithm to determine
correct lens iris position based on the
IrisVideoLevel
attribute.
5.
If lens operation is too slow or oscillates, see
LensDCDriveStrength
.
P-Iris lenses
P-Iris (Precise iris) lenses allow the camera to adjust to an exact F-number with-
out drift, through the usage of a stepper motor. The host system knows the
exact position of the iris at all times, allowing for a closed loop feedback sys-
tem.
Operation
1.
Connect a P-Iris lens to the camera before powering up the camera.
2.
Power up camera, and open camera control software.
3.
Set camera to live image with desired
ExposureValue
and
GainValue
attri-
butes.
4.
Set
LensPIrisFrequency
as specified by lens documentation, or in sup-
ported P-Iris lens list, as described in the next section. All P-Iris lenses
tested thus far operate well between [100-200].
5.
Set
LensPIrisNumSteps
as specified by lens documentation, or in sup-
ported P-Iris lens list, as described in the next section.
6.
Set
IrisMode
attribute to
PIrisAuto
or
PIrisManual
.
PIrisAuto
uses an
automatic algorithm to determine correct
LensPIrisPosition
based on the
www
DC-Iris controls are described further in the following docu-
ments:
PvAPI users
GigE Camera and Driver Attributes
document
VIMBA and third-party software users
:
document