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There doesn't seem one lens that does everything. Surprise, surprise. The 70-200 is too short for birding, the 100-400 is too bulky for birding and has the oldest IS technology, the 400 prime is only good for birding and leaves a 'hole' from 85 to 400mm .... The 70-300 might be a good compromise if 300 is long enough for birding but it is the only L lens that doesn't accept an extender.
I had a look at the site Leon recommended and the image degradation of the extenders is obvious, especially the 2x. On the other hand a 70-200 with a 2x extender is still sharper than my present EF-S lens. I'll have a look at the sites recommended by others tonight and perhaps I can reach a decision before my brain explodes.
Anyone want to comment on the 70-200 f/2.8 Mark 1 vs Mark 2? And how often in the real world is f/2.8 an advantage over f/4?
BTW Leon, what lens did you use for the wagtail series you posted a month or so ago?
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