I am looking to move into the world of horse photography. I just bought a Nikon D3100 and I'm looking to photograph show jumping (both indoor and outdoor), cross country, and some dressage (mainly outdoor). I was wondering if you could give me some tips on setting the ISO, shutter speed and aperture. I know I will need a better lens also, and I have just bought a 55-200mm on eBay. I will post the model number tomorrow. Any help would be great. I do have some pictures I have taken with my Fugi Finepix point and shoot.