Same of the 180/2,8, just a stop slower, but a lot smaller (it fits into a large pocket).
In short, compared to the 80-200/2,8 or the 70/200 AF, it is a lot smaller, lighter, a bit (or not so bit, again depending of your zoom sample, and remember the sample variation is stronger in zooms) sharper (but from f/5,6 and below), just a little darker.
A great travel companion, and you may find one of this for the price of the 80-200 hood alone.
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