Another point is to consider is max object magnification at minimum focus distance.
300mm f4 IS ~1:4 with x1.4TC ~1:3 ( makes a good butterfly lens)
400mm f5.6 ~1:9 (the minimum focal distance could be reduced with extension tubes - I think Saphire tried this but I can't remember the results)
100-400mm ~1:5
We have not talked about the lower sensor pixel density of the 5D compared to 30D or 400D for a given sensor area.
The 5D favours wide angle work whereas the 30D & 400D favour telephoto work.
Of course a lot depends on the size of your wildlife and the shooting distance - any clues in this department Earthtones ?
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Rob
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Last edited by robski; 04-07-07 at 23:30.
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