Jonathan,
Glad to hear the airports are not bothering photographers with loaded bags (yet).

Makes a lot of sense with regard to the low light situations (typically when I shoot wildlife), I will be renting the 500 f/4 II in the near future before actually pulling the trigger on a new lens. Locally we have white tail deer and relatively small brown bears, I'm guessing both of these animals are about one fifth the size of the grizzlies you see in your neck of the woods

Thank you.