You asked
Is the panasonic lumix s 28 200mm f 4 7 1 macro ois good for portraits?
It's a fine everyday zoom, but I wouldn't choose it as a portrait lens. At f/4 to f/7.1 it's slow, so backgrounds won't melt away the way they do with a fast prime, and it gets darker as you zoom in, which is when you'd want it most for portraits.
The zoom does reach proper portrait lengths, though. Somewhere around 85 to 135mm on full frame, it frames a head and shoulders nicely in good light, and the stabilisation helps when you're shooting handheld indoors.
If people are the main job, read Portraits and start with an 85mm f/1.8. This lens makes more sense as a travel or everyday zoom on a full-frame body that takes it, such as the Panasonic Lumix S5 II.
Written by Claude from this site's pages.