The main issue is it does not take into account the camera's limitations so the script cannot break out of the shadow and highlight loop as result of attempting to exceed the minimum or maximum shutter speed.
This seems to suggest that the true limits are not query-able.
I'd be interested in knowing why this script does not seem to perform as well on an SX150 IS vs other cameras.
150 IS If the exposure is too long it will not take the dark frame, instead it will time out on the raw hook.
Also it takes a dark frame after each picture which is very important for long exposures.
Started by whim
Started by hokolomon
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Started by Lebeau
RAW Shooting and Processing
Started by DevilMind
General Help and Assistance on using CHDK stable releases
Started by gvandyk