Thanks - I may look at getting a better model that'll take CHDK at some point - I picked up the A490 and A495 because they were dirt cheap, have no IS and work great for aerial photography, especially on multirotors. I just thought I'd try them for night time lapses since I already have the CHDK with them.
FWIW, in this case it's more a matter of newer than cheaper. I don't know where the exact cut-off is, but neither my elph130 or sx160 suffer from amp glow much.
I'll try it with dark frames enabled - but unless I'm mistaken, aren't dark frames more for use with long exposures stacked for one clear image, not so much with time lapses?
Dark frames are good for reducing the effects of amp glow and hot pixels, regardless of how you will use the final image.
If you enable canon dark frame subtraction on the camera, there will be a big gap between each shot, because the canon firmware will do a dark frame of equal length after each exposure.
To avoid this, you need a way to do the subtraction on each frame before making the video. I have done this using raw therapee batch processing (this clip
https://app.box.com/files/0/f/3350614644/1/f_46635641505 for example). For best results, you will want to use RAW, but I believe raw therapee will let you dark frame jpegs. Shooting raw will also cause some gap between frames, because it takes several seconds to save on cameras like this.
When you say the bug you found made it ignore the interval - exactly how?
It would just shoot the next shot as soon as the previous one was finished. So if you set a 4 second exposure and a ten second interval, it would still shoot once every 4 seconds (+ processing / saving time). I reorganized some stuff before posting that version and didn't test thoroughly
This doesn't affect the exposure length though. If I've understood your problem correctly, you set a 32 second exposure, but after the first shot, the actual exposure is shorter?
And on your D10 it doesn't matter what you set the continuous option (on Canon firmware) to it will still take continuous long exposures?
Yes.
