I am a hobbyist photographer who mostly takes pictures of tennis matches and indoor volleyball. I would like to get more experience with natural light portrait photography, but the aforementioned sports will always be the primary focuses. I currently have a Sony SLT-A77 with the Sony Sony SAL70200G 70-200mm f/2.8 SSM lens. I'm ready to buy another lens to add to my kit, but I'm not sure where to go from here. My budget is under $800. Any suggestions are greatly appreciated. Cheers.