You asked

Is the leica elmarit m 90mm f 2 8 good for portraits?

Yes, the Leica Elmarit-M 90mm f/2.8 is a good portrait lens. At 90mm on full frame it sits right beside the 85mm that portraits calls the classic portrait focal length. You get flattering perspective and a comfortable working distance, and f/2.8 gives you some background separation.

It's manual focus only, so take your time getting focus on people's eyes. It's also a common, affordable used lens, which makes it an easy choice to try.

It fits a good run of full frame Leica M bodies, including the Leica M10, Leica M11, and Leica M (Typ 240).

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