Use a suitable lens with a large aperture for fine adjustment.
Follow these steps for the fine adjustment:
•Set the lens focus to infinity and look at an object which is far away.
•Rule of thumb: The distance to the object must be at least 200 times the focal length of the
lens. The further away, the better.
•Then turn the lens mount in until the object is sharp.
•Look at an object which is positioned at the minimum working distance of your lens (as
described in the corresponding datasheet).
•Set the lens focus to the minimum working distance (the opposite direction of infinity).
•Now adjust the lens mount until this object is sharp.
•Repeat the above steps until the focus is consistently sharp in both positions.
CAUTION: The allen screws are designed for a maximum torque of 1 Nm. All torque values in
this manual are recommendations.
Figure 2.2: sensor size vs. image
circles of various C-mount lenses.
Keep in mind that C-mount lenses can cause shadings at the
edges of large-sized sensors.
Most C-mount lenses can illuminate a maximum image circle
in the range of 9 mm (1/1.8’’) to 22 mm (4/3’’) diameter only.
The pco.pixelflyTM 1.3 SWIR has a sensor diagonal of 8.2
mm.
To achieve less shaded images, the ROI function can be used
to limit the resolution of the sensor when using lenses with
smaller image circles than the sensor diameter.
2.3.2 F-mount adapter
The optional F-mount adapter is screwed in the front of the camera and fixed with by the lower
adjustment ring of the adapter. In order to set the accurate back focal distance of the F-mount
(46.50 mm), the position of the adapter can be adjusted. The same procedure as described in
chapter 2.3.1 is applicable.
pco.pixelfly™ 1.3 SWIR Chapter 2
pco.pixelfly™ 1.3 SWIR user manual 1.0.0 8
