Icee
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- Iain
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Either would do the job for you. The Sigma is heaver is said to focus faster, but it can't be by much as my 200-500 is fast enough for sports work and birds in flight, but I'm sure I read that the Sigma has full weather sealing which might be an advantage for what you want it for.

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Chaffinch 1
Chaffinch 5
Chaffinch 8
Robin 2
Blue Tit 6
Blackbird 3
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