Originally posted by Wheatfield DO we really have to go down this road of stupidy again?
Some variously think 'portrait' means headshots, or candids, or formal studio sittings, or group shots, or whatever. We can shoot portraits with almost anything at various speeds and distances. So we can't recommend a 'portrait' lens unless we know just what the questioner has in mind. 55-75-90-105-135mm are all 'portrait' lenses. So are 25-35-45-150-180mm, and beyond, depending on circumstances and desires.
The question is not stupid. It is vital. It's like asking about a 'racing' car. That could include anything from go-karts to LSR (land speed record) jetmobiles. If we don't know what kind of racing (or portraits) are involved, our answers won't mean much.