Do you have a 1.4X Teleconverter? The shot you show is a great find. You were at f/8 anyway with ISO 100 at 400mm. The teleconverter would have gotten you to 560mm, and then you had plenty of room to push your ISO up to get the shutter speed you need. When I go looking for snow owl with my 100-400mm lens, the 1.4X is always on it, and I will push the ISO up to 1250 to get the shutter speed. Another thing that seems to help preserve detail is a flash, and it does not seem to bother them much.
Again... great find.
Pat





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