I'm mixed on using the 100-400 for flight. Some really good pros say it’s a wonderful flight lens. I find that it depends on the size of the subject.
Things like Great Blue Herons it works fine on. They fly fairly slow and they are large enough for the AF to detect and lock on. The same applies to the red tail/shoulder hawks I see... or even crows. They are large enough and move slow enough that it works.
Things like terns are another matter entirely. They are so small the AF doesn't always find them and then hunts. And when it does that you are dead in the water because the view goes completely blurry and they are long gone before you can find them. But if you can track the bird, it can lock on to something even that small.
paulh, my vote is for Doppler radar to guide the camera in following the swift or swallow in flight. That would solve all my problems.
Eric
Things like Great Blue Herons it works fine on. They fly fairly slow and they are large enough for the AF to detect and lock on. The same applies to the red tail/shoulder hawks I see... or even crows. They are large enough and move slow enough that it works.
Things like terns are another matter entirely. They are so small the AF doesn't always find them and then hunts. And when it does that you are dead in the water because the view goes completely blurry and they are long gone before you can find them. But if you can track the bird, it can lock on to something even that small.
paulh, my vote is for Doppler radar to guide the camera in following the swift or swallow in flight. That would solve all my problems.
Eric