I'm just starting out with a Nikon D3200, and my subject of interest is action photography with horses (show jumpers, dressage, etc). I'm trying to decide what my next lens purchase should be for these outdoor events. The lighting is not always consistent, so I need something that would be able to shoot in both low and high light settings. Trying to find the best lens that will deliver great/sharp images. Keep in mind, I cannot get physically close to my subjects, so the I will need a lens that works well in a stadium type atmosphere - like a soccer field.
Any thoughts? Any help would be appreciated!