Indoor soccer is really tough to get clear pictures. Until I tried using by 7D (set at ISO 2000) with my 300mm f2.8 lens, I never really took anything worth saving. ISO drives the graininess of the pictures....the higher the number the less clarity, but the 7D performs well up to ~2500. They are not the same as a sunny day outdoors, but they're not too bad. Take a look!