Quote Originally Posted by Anbesol
Well, it does show the same field of view as a 400mm, but lens behave differently at different mm angles. So, yes and no, the 400mm equivalent doesn't mean the lens behaves like a 400mm lens, just presenting the same field of view as one.
I agree. But I think you will get the best of the lens vs. the worst, as the corner quality is often softer and darker.