Stefano, the HN-2 lens hood is the correct lens hood for two Nikkor lens sizes with 52mm screw size.
All of the 28 mm lenses and the 35-70 zoom in it's different versions.
I have both the 28 2.8 and the 35-70 3.3~4.5 Nikkor lenses and use the HN-2 for both.
When you fit one filter onto the 35-70 then the HN-2 lens hood you do not get any vignetting, which is as it should be.
Also, as it is a metal hood, it offers quite good protection if your camera is swinging from a strap.
Mick.