You asked
Is a 70 200mm good for portraits?
Yes, a 70-200mm is a good portrait lens, as long as you have room. Longer focal lengths flatter faces because you stand further away, and that keeps noses and chins in proportion. The portraits guide recommends 70-200mm f/2.8 for tight headshots and strong background blur outdoors.
The 70-200mm lenses I have listed are f/4, so they give a little less blur than an f/2.8 model. Still, they're a fine choice for outdoor portraits:
If you shoot indoors or in small rooms, a 70-200mm will be hard to work with. A 50mm or 85mm is easier there. For more on focal lengths, see the lenses guide.
Written by Claude from this site's pages.