I am shooting my sons football games (outdoors) and my daughters cheerleading (indoors) and dance recitals. I have a 70-300mm f/4.5-5 and I am not happy with my photos (this could totally just be my terrible photo shooting), so I have been looking at upgrading to the canon 70-200mm f2.8 is ii. My question is, is it worth it? Should I just look at the Tamron 70-200mm f/2.8, or is there another lens that I should look at?
Thanks in advance.