Look into using CHDK and an inexpensive Canon Elph camera. http://chdk.wikia.com/wiki/CHDK
This will allow you to hack the firmware of most any Canon Elph cameras and program them to do interval shooting, and much, much more. We use it on nearly every flight. If you have a computer or laptop with Linux on it, it is easier to implement the CHDK changes than with Windows due to the way Windows views partitions on SD cards. (It's still do-able, just more fiddly.)
Also, we have found from multiple testings that if you can keep your cameras in a sealed container with desiccant until the last possible moment, fogging of the lenses is essentially eliminated. This goes for not only stills cameras, but video as well.
Inexpensive Canon Elph's are available on Ebay - double check CHDK with the model number of the camera to ensure that CHDK will work as it is not available for all models of Elph.
For example, this shot was taken at apogee on November 5 of 2016.
Also keep your flight time in mind - most camera batteries do not have the capacity to last during a full flight. My son modeled a Canon battery in Solidworks that we then had 3D printed, added leads to it and ran those out of the camera body to a 2500 mAH battery from Adafruit. This enabled the camera to take photos all the way up and all the way down, as opposed to shutting down after about an hour or so (the standard Canon Elph batteries are, I believe, somewhere around 680 mAH, which really doesn't last long).
Best of luck, and please a) ask any questions you have, and b) post your pics!