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I have about 800 $ to spend on a longer lens. Currently my longest lens is the 85 f/1.8. I shoot Division 1 college athletics (football, soccer, basketball, volleyball, hockey). My 85 is great and the AF on my 7d is really treating me well i just need something longer for football and soccer. My two options are the 200 f/2.8 prime or the 70-200 f/4 zoom. What do you think?