Difference between revisions of "Focusing the video lens"
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In full scrren/enlarged mode, the image update may be slow or freeze. This is related to the CPU load - transferring image from video camera over USB and scaling it to screen buffer. Restart the above commend if that happens and zoom in only partially or zoom 1:1, but shrink the window. | In full scrren/enlarged mode, the image update may be slow or freeze. This is related to the CPU load - transferring image from video camera over USB and scaling it to screen buffer. Restart the above commend if that happens and zoom in only partially or zoom 1:1, but shrink the window. | ||
| − | A tiny hex key (size TBD - 0.8 mm or 0.6 mm) is needed to loosen the video lens focus fixing bolts. There are 3 of these tiny bolts - to access them, the lens needs to be removed from the camera | + | A tiny hex key (size TBD - 0.8 mm or 0.6 mm) is needed to loosen the video lens focus fixing bolts and to tighten them again when focussed. There are 3 of these tiny bolts - to access them, the lens needs to be removed from the camera enclosure. |
''Note: Set the F-stop (mechanical lever on the lens) to full open, check if the focus is sharp as with f/1.8 or f/2.0. If yes, keep the wide open setting. If not, stop down to f/1.8 or f/2.0. | ''Note: Set the F-stop (mechanical lever on the lens) to full open, check if the focus is sharp as with f/1.8 or f/2.0. If yes, keep the wide open setting. If not, stop down to f/1.8 or f/2.0. | ||
Revision as of 04:21, 25 November 2020
This page describes how to focus FUJINON video camera lens in DFNEXT camera systems (Point grey / FLIR digital cameras) using freeture video capture software.
Contents
Stop the freeture SW running as service
systemctl stop freeture.service
Run freeture in to display currently captured video live on screen
Login as user which is not root locally (keyboard + monitor + mouse needed).
Start windows manager
startx
Start terminal. The ollowing commands are to be executed in x-terminal.
Switch user to root may be needed
su - root
Run freeture, zoom in, set window with video full screen or enlarge it to se the focus is sharp:
freeture -m 2 --display -g GAIN -e EXPOSURE_TIME
Use GAIN (0 .. 29.99) and EXPOSURE time (0-33000 in microseconds; max exposure time is driven by frame rate 30Hz) appropriate for current lighting conditions.
In full scrren/enlarged mode, the image update may be slow or freeze. This is related to the CPU load - transferring image from video camera over USB and scaling it to screen buffer. Restart the above commend if that happens and zoom in only partially or zoom 1:1, but shrink the window.
A tiny hex key (size TBD - 0.8 mm or 0.6 mm) is needed to loosen the video lens focus fixing bolts and to tighten them again when focussed. There are 3 of these tiny bolts - to access them, the lens needs to be removed from the camera enclosure.
Note: Set the F-stop (mechanical lever on the lens) to full open, check if the focus is sharp as with f/1.8 or f/2.0. If yes, keep the wide open setting. If not, stop down to f/1.8 or f/2.0.
Stop freeture
By pressing [Esc] in the terminal window where it was started.
Start the freeture SW running as service again
systemctl start freeture.service
