You asked
Best portrait lens for the olympus pen e pl5?
For portraits on the PEN E-PL5, I'd aim for a lens around 45mm. On Micro Four Thirds that frames like 90mm on full frame, the classic portrait length, and it keeps you at a flattering distance from your subject.
My top pick is the Olympus M.Zuiko 45mm f/1.2 PRO. It's fast, so you get soft backgrounds and usable light indoors. If you want something smaller and cheaper to carry, the Olympus M.Zuiko 45mm f/1.8 gets you most of the way there. The Panasonic Leica DG 42.5mm f/1.2 is the other serious option if you prefer its look.
Whichever lens you pick, light will do more for your portraits than the glass. Read the Portraits page, especially light beats gear.
Written by Claude from this site's pages.