I have the target shutter speed set to 1/1600, and most images are being shot correctly at that speed, however I've come across a couple which were shot at a lower shutter speed and iso, and are blurry because of it.
This is most curious. Would you say the exposure was correct (i.e. not too dark or too bright) even though the shutter speed was not what you required?
Thanks for posting the log entries. I color coded a couple of things that pop out right away and commented below.
In my kap.log for some of those files, this is the output:
2013Dec06 15:02:52 26) IMG_1022.JPG
2013Dec06 15:02:52 meter : Tv:1/640 Av:2.8 Sv:80 827:827
2013Dec06 15:02:52 actual: Tv:1/1600 Av:- Sv:160
2013Dec06 15:02:59 27) IMG_1023.JPG
2013Dec06 15:02:59 meter : Tv:1/320 Av:5.6 Sv:80 910:910
2013Dec06 15:02:59 actual: Tv:1/1600 Av:- Sv:400
2013Dec06 15:02:59 AvMin:2.8 NDF:none foc:infinity
2013Dec06 15:03:07 28) IMG_1024.JPG
2013Dec06 15:03:07 meter : Tv:1/125 Av:5.6 Sv:n/a 838:838
2013Dec06 15:03:07 actual: Tv:1/1600 Av:- Sv:640
2013Dec06 15:03:07 AvMin:2.8 NDF:none foc:infinity
2013Dec06 15:03:13 29) IMG_1025.JPG
2013Dec06 15:03:14 meter : Tv:1/500 Av:2.8 Sv:80 780:780
2013Dec06 15:03:14 actual: Tv:1/1600 Av:- Sv:250
2013Dec06 15:03:14 AvMin:2.8 NDF:none foc:infinity
First of all, the script did try to take every shot at 1/1600. You can see that in the log lines that start with the word "
actual".
Secondly, the SD960 has a fixed aperture. Yet the camera is trying to use
f2.8 for some shots and
f5.6 for other shots. One of two things must be happening here. Either the zoom position is changing or the camera's Neutral Density filter is being engaged by the Canon firmware. Are you changing the zoom setting some how between shots? If not, it must be the ND filter, and that will cause unwanted exposure variations. (Notice that the Canon firmware is only trying to use the f5.6 setting in brighter scenes). Set the
AV Mode in the script parameters to "NdFlter" and the script will manage that for you. (Its not clear how this would cause the shutter override not to work though .. )
Finally, when taking image IMG_1024.JPG, the camera's light meter system tried to select an
ISO setting below the range expected by the script. That's quite curious but should not have caused any problems.
When I look at the exif for these files, they don't match up to the log:
IMG_1022.JPG is 1/400, f2.8, iso 50.
IMG_1023.JPG is 1/200, f2.8, iso 50
IMG_1024.JPG is 1/1600 iso 640 (as it should be)
IMG_1025.JPG is 1/320, f2.8, iso 50.
Do the exif values for other images match the log entries made by the script? ( Other than ISO80 being reported as ISO50 ).
tl;dr : try setting the
AV Mode in the script parameters to
"NdFlter"
