I have a D7100, would this lens be suitable for close up action shots of gymnast and wrestling events that my grandchildren are involved? Neither events allow a flash.
85mm won't get you that close. The D7100 is DX, not FX, so you don't have that full format range. And the speed of this lens--3.8-45--isn't very fast. But, on the other hand, it is VR, which gives you the equivalent of two stops on the wide side, and it is ove 20MP, so you can crop. If you were shooting at 3200, it would give you a lot of latitude and you could clean up the noise in Lightroom.