This is NOT an F2.8 lens

A few words of caution to all would be buyers of this 'fast', super, reasonably priced lens.....

When mounted on the Nikon (F/N80)body, whether in Manual/Aperture or whatever priority, as soon as the distance scale goes BELOW FIFTEEN feet, whether on autofocus or manual focus, the Nikon-in-camera-computer reduces the lens aperture to F3,0 and then progressively all the way down to f5.6 at the macro distance.

When the aperture ring on the lens is set to f2.8, the camera refuses to give a speed, or take a shot, whether on manual or auto-focus; and whether on M manual setting, (then what the heck is a manual setting for??) or Aperture priority setting...

I cant recommend it to a friend, as it may well not be the f2.8 superfast lens..all the way down...for which he yearns...

And no, it doesn't feel like plastic but some other space- age material.
It just shows EE...

So what has Tamron produced..Methinks an f2.8-f5.6 lens Should it not the, to be absolutely honest and preserve their reputation, be designated and advertised as such..

If I have missed something, please somebody tell me.....Because the other two reviewers make no mention of this fact.