Focus adjustment 393
From ElphelWiki
Contents
Description
internal use
Regular SFE
- used on big the Xeon PC - 192.168.0.6
- restore from /home/elphel/test_focusing/default.conf-xml
- quick get&show
- find grid (if error - increase/decrease exposure using the 'camera settings' button - the range is 2.5-5.0 ms - rerun steps 3. and 4.)
- no-move measure
- show PSF
- adjust screws
- repeat from 4. until good
Setup before using ImageJ Aberration Calibration plugin
Parts
- Assembled SFE without lens and without IR-cut filter (can be with the filter if the target lens is different)
- M12 adapter
- 2 spacers: 5mm and 4.7mm (shaved off 0.3mm (made from 5mm spacer) for optimal adjustment)
- Lens N125B04530W with IR-cut filter. If the target lens is different, still use this one for adjustment then replace. Wrap the thread of the lens with the teflon tape for better thread fitting - 2 layers if enough. When screwing in make sure the tape does not get in the optical path.
- Focus adjustment screws - do not overtighten initially. Later, right before starting the procedure when the camera is against the pattern - turn it on, while in jpeg open the control interface and adjust the screws for the best manual focus (do not apply too much force).
Assembled setup
- Take a longer cable - at least 100mm
- Connect to port 0
- Set the camera address to 192.168.0.38
- Make sure the power supply provides the right voltage - 12V or 48V. If possible install PoE compatible power board - 10386.
Pattern
- Use the wallpaper pattern
- Make sure all 4 lasers are pointing in the right spots - "manual laser pointers" yellow button in the imagej plugin
- Turn off the room lights.
- Turn on the patter lights if they are not on automatically.
- No need to close the garage door.
- Now proceed with regular_SFE instructions.