Last year I went on an extended trip of six months in the outback and discovered I liked photographing birds. My current longest lens is the Canon 70-200m which isn't long enough.
I am really keen on purchasing the 400mm lens but the guy at the camera tells me the 100-400mm lens would be much better.
Ideally I would like something even longer, but these two lenses are in my price frame. The 400mm is a prime. Is this a disadvantage for birding? Which lens?
Does an extender work well with either of these lens?