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re lens
You will not need the monopod with the 400 L prime,I have one,I thought I might need it,but never used it.
The 100-400 I have used,its big and heavy,also when out at 400 its long,when you are in the field all the time after wildlife images,you are always at 400,also the 100-400 when at 400 is a considerable length being that long outdoors on uneven ground,its easy to get unbalanced with that long length and get caught up in shrubs etc.
Another advantage over this lens,is that its a very fine astronomy lens,only 7 elements,no reflections (my 70-200 F 2.8 i cannot use it has so many elements and causes reflections)
The other lenses in your list,I have used them all for wildlife/birding,the 400 L prime is the best by far.
Chris
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