I can definitely confirm, sometimes DNGs are not saved when using SDO, and all shots at all focal lengths end up out of focus regardless of subject distance...
I have a hard time believing that it was SDO testing causing some DNG's not to be saved. DNG's not being saved is typically an issue with lack of RAM. If the camera's heap runs out of space, CHDK will not be able to allocate space for working with the DNG file and will simply not attempt to store one. The CHDK "show memory info" function shows 634840 bytes of free memory on my loaner ixus300. IIRC, that's not very much. reyalp can probably comment on that and whether a different memory model might be appropriate for this camera.
The hooktest script may show if there are file counter issues http://chdk.wikia.com/wiki/Testing#hooktest.lua
Please, if you have an SD4000 with you, do some detailed testing - take a couple of weeks if you have to, even months!, it doesn't have to be finished tomorrow.
I've never had DNG writing issues before, why is this an issue now?
How can I be sure that the next fix would not uncover some other bugs?
It looks pretty good now! Release tested ixus300_sd4000-100d-1.4.1-4901-full
1) CHDK Auto ISO + Flash On After firing the flash, camera shuts down without recording JPG nor DNG. I noticed that Canon Auto ISO goes only up to 250 with Flash on. Maybe this causes the crash.
2) RAW toggle On/Off It should be Display button in Alt? Nothing happens. I suppose now that buttons are fixed this could work. It's convenient sometimes, faster than menus.
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