Gord,(posted 8627 days ago)Lead bags don't stop cosmic rays, and that is what is fogging long sorage of fast films. Heck, the earth itself barely slows them down.
As tot he freezer temp, it doesn't really matter. Chemical reactions are slower by a factor of two for every (I think) 10 degrees C reduction in the temp. So the lower the better. You will NOT see any difference in a few weeks. A few years of testing would be required.