Camera interfaces
AVT Prosilica GT Technical Manual
V2.0.8
60
DC-Iris lenses
The Prosilica GT operates with any standard DC-type auto iris lens. AVT 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
The control attributes for DC-Iris controls are described further
in the following documents:
PvAPI users
:
AVT GigE Camera and Driver Attributes
document
VIMBA users
:
AVT GigE Camera and Driver Features
document