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re lens
David,Rowland makes a good point here.
He has thought long and hard about his approach and interests in regard to HIS needs,and got the best kit to suit those needs and interest areas.
I feel,many lenses are 'special purpose' lenses,-and each of us here is fairly dedicated to a few particular branches of photography,so looking for that 'all purpose use' lens is pretty hard.
Its a bit like asking for an all purpose rifle/fishing rod/metal detector etc,they just do not exist,if there was a all purpose lens,we would all have a 10 mm to 1000 mm that would fit in out top pocket.
So we have to think of what we truly want the best results in a certain area of our interest.
You mention birding,I too spend many hours in the field,have used many different lenses,and the best I have used is that 400 L f 5.6 L,(if funds were unlimited-get the Canon 500 L F 4)
For regular use on everyday things and some birding a 70-200 F 4 is ideal,(either non IS or IS,i'd go for the non IS)
Those are the two very finest lens that I would take on a overseas birding trip (well if I won lotto the 500L would be coming too,but I'd still take that 400 its so light)
I have a 70-200 F 2.8 I have used it for birding,its ok when I get very close,but woul not recommend it for birding-once again I thought long a hard on what I needed it for,before I bought it and are very happy with it foer that purpose.
Knowing what I know now,I may have bought a 70-200 F4 as it would certainly get a bit more regular general use.
Hope this helps,Chris
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