I tried again this morning with sunlight; which seems to be a factor. With CHDK running (SD card locked) and no script activated, the shooting in continuous mode manually takes ~1s. Then I ran your latest hooktest script and the the shooting seems to be now faster in continuous and single shot mode as well (logs attached).
What ISO setting?
I assume flash is disabled?
What kind of shutter speed are you getting when it's slow?
Between 3-5 seconds.
You can check the value recorded in exif, or post an example image here.
Auto ISO can probably explain at least some of the issue. If you want to avoid the slowdown, you can manually set the ISO at different levels and see where it slows down (likely 400 or 800) but that may not be a good trade if it results in longer exposures.
I don't get the extra pulse on the Shot Sync LED between shots outdoors with overcast sunlight. Here is the log file.
wait_timeout(hook_shoot.is_ready, true, 2000, 10, "timeout on hook_shoot.is_ready") -- wait until the hook is reached
wait_timeout(hook_shoot.is_ready, true, 10000, 10, "timeout on hook_shoot.is_ready") -- wait until the hook is reached
I now wonder if this will be a factor when the camera body is inside the fuselage of the fixed-wing; which is dark when it is enclosed.
So try increasing the timeout from 2 seconds to 10 seconds by changing line 831 in the script from
CHDK does not really know or care if the camera body is in the dark or brightly lit. It only cares about the amount of light coming through the lens.
but I was wondering if it'd be possible to add code into the CHDK api to parse MAVLink messages so your LUA script can geotag the photos after it receives the trigger message from the flight controller; which also comes with 'GLOBAL_POSITION_INT' information.
The tricky bit is not the Lua script in the camera, it's programming the host device to originate the transmission to the camera.
That should be feasible using a FDTI adapter between the FCU and the Camera, as shown in the pic below.
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RAW Shooting and Processing