I had just taken delivery of my new wildlife lens so I thought I would go over the local pond and try it on a few swallows but then along came Christina riding western on Braveheart, her lovely Rocky Mountain horse.  Quite a good test fro a 400mm handheld shot.  Very different to my normal equine portrait lens but I still find a 400mm useful when trying to photograph horses that like to crazy when they are first turned out