The Canon 100-400L has somewhat mixed reviews too, if you get a good one it is very good but some are apparently very mediocre. It is also a ten year old design which must be due a replacement soon (please). Sigma have announced a 120-400 zoom with 4 stop optical stabilisation and HSM focusing which you can preorder from Warehouseexpress for £600. Weighs 1750 grams though as well as being an unknown quantity at present. As always choices, choices.....
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