Not very good indoors or in low light.
This is an amateur lens designed for the weekend warrior who wants to shoot the kids sports or some birds, etc. It worked great when there was plenty of light, but it struggled to find focus indoors and at low light settings, with my D4s. The 80-400 4.5-5.6 had no problems in low light, indoors on a D7100, at 400mm f/5.6. It went back to B&H the next day (great store, no hassles!)
I question the T-stop value of this lens. F/5.6 is the theoretical f stop (focal length divided by diameter), whereas the T-stop is the actual amount of light that is transmitted through the lens at a given aperture. At a T-stop value of f/8, Nikon lenses are at their AF limit. There are many reviews by other users who cite the limitations of this lens.
Overall it's a good lens, but very limited.
This is an amateur lens designed for the weekend warrior who wants to shoot the kids sports or some birds, etc. It worked great when there was plenty of light, but it struggled to find focus indoors and at low light settings, with my D4s. The 80-400 4.5-5.6 had no problems in low light, indoors on a D7100, at 400mm f/5.6. It went back to B&H the next day (great store, no hassles!)
I question the T-stop value of this lens. F/5.6 is the theoretical f stop (focal length divided by diameter), whereas the T-stop is the actual amount of light that is transmitted through the lens at a given aperture. At a T-stop value of f/8, Nikon lenses are at their AF limit. There are many reviews by other users who cite the limitations of this lens.
Overall it's a good lens, but very limited.

