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300mm for wildlife isn't really enough you should be looking at closer to 500mm even on a crop sensor
iv'e seen great results using the 7d and a sigma 150 - 500mm os lens
even with your existing 500d the sigma 150 - 500mm os lens would do nicely
although the difference between the 500d and the 7d is significant good lenses will have far more influence on the final result
i don't really do landscapes so cant advise on a suitable lens
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