waterwingz:
That's correct. I had Ev step override at 1/1000 and overrideISO at 100. All pictures were confirmed as being taken at these values.
When I'd take about 16 pictures, one or two would appear to be underexposed (very dark as I would say in my non-technical terms, haha). The only difference from these and the ones that looked good were that the f value would be at 8 instead of 2.7.
At your suggestion, I put two of the exact same cameras, ELPH 110HS, with the exact same build of CHDK on there and all the same values. The only difference was one had "ND filter state Off" and the other "out." pictures were then taken side by side at the same time. All pictures on both cameras were the same, using the same settings, including when the F 8 was used.
To add to that, I just ran the test again, but this time on the second camera I used your KAP UAV script. Giving it a range of very quick shutter values and low ISO, but still having the "Allow use of ND filter?" in the "no" position gave no "dark looking" pictures. It did, however report using F 8 on every picture that the first camera did. The second camera was able to drop the shutter speed though, so the picture still wasn't underexposed.
As far as I can tell, the ND filter control options aren't changing anything. The camera still reports using F8 on all the same pictures as the camera that is not controlling ND filter.
-Colin
