ALLIED Vision Technologies Prosilica GT6600 - Manual (Page 65)

Camera interfaces
AVT Prosilica GT Technical Manual V2.1.0
65
DC-Iris lenses
The Prosilica GT standard and long cameras operate 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
IrisVideoLevel attribute. PirisManual allows manual control of LensPIris-
Position.
www

DC-Iris controls are described further in the following docu-
ments:
PvAPI users: AVT GigE Camera and Driver Attributes document
VIMBA users: AVT GigE Camera and Driver Features document