Subtitle : Getting the "set_focus()" command in CHDK scripts, or the "Override Subject Distance" menu item in the Enhanced Photo Operations menu, to work.
set_aflock()
- set_aflock(1) causes the Canon firmware to stop focussing when shooting
- does an initial focus measurement and sets focus at that value when called
- set_aflock(0) restores camera automatic focussing.
- works on all cameras
- using this does not seem to affect whether set_focus() works on does not. If it works before calling set_aflock() it will work after (allowing you to change the focus distance). If set_focus() was not working prior to set_aflock() it still won't work afterwards.
- if you call set_aflock() and then set_focus() (in a mode on your camera where that works) then the focus for all subsequent shots will stay at the value specified in set_focus(). If set_aflock() has not been called then set_focus() will only apply to the next shot - after that the camera will revery to auto focus.
set_focus()
- script command that may or may not actually set the focus setting (in mm) the next time the camera shoots.
- on some cameras, set_focus() will only work if the camera is in Canon AFL mode (ex: A1200)
- on some cameras, set_focus() will only work if the camera is in Canon MF mode (ex: SX50HS)
- on some cameras, set_focus() will only work when the camera is in P mode (or at least not in AUTO)
- on some cameras, set_focus works every time regardless of mode (ex: G10, SD940)
- Notes :
- Canon AFL mode is typically achieved via simulated button presses using click() - see your camera manual for the correct sequence. May require holding a "half press" while another key is clicked.
- Canon MF mode is may be achieved via simulated button presses, post_levent_for_npt call, and/or call_event_proc calls.
Forum Links
http://chdk.setepontos.com/index.php?topic=9533.0
http://chdk.setepontos.com/index.php?topic=8016.msg94251#msg94251
http://chdk.setepontos.com/index.php?topic=6672.msg75166#msg75166