I have the Nikon D5100 with the 18-55mm and 55-200mm lens. I was pretty happy with the photos I took at the last competition, but I still have photos with some blurring. The competitions are indoors with poor lighting. For the most part we are able to get pretty close. What can I do to make my photos less blurry using what I already have? Any suggestions for a new lens? Thank you.