The 400/5.6L is a great lens for swallows. I've shot most of my swallows with it but I was always much closer to them than 75-100 yards. So much so that I sometimes brought my 300/4L. Is there no way you can get closer? Surely there is way to find out where they nest, so you can position yourself nearby. That would make shooting them much easier for you. And then you could use your 400/5.6L or your 100-400II which are much better lenses for shooting these little bullets.
Zoom lenses are something to get used to. I always shot with primes. The 100-500 is my first zoom lens and it's taken me quite a bit of time to get used to it or rather to remember that it actually CAN zoom at all. But today it proved very useful with the swallows. Still, they're hard birds to shoot, that's for sure.
I set up on a dam on the side of the pond, it is about 200 yards wide and 300 yards long. It is all private property except for the dam. Here are a couple of the swallows, I think they are barn swallows but may be tree swallows. I have about 10 more out of 400 to process
1st is the cropped one and then the original
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