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I am currently in the market for a zoom lens and have narrowed my search down to the canon 70-200 f/2.8, f/4 or the sigma macro 70-200 f/2.8. I shoot mainly portraits and my kids' sports(mostly outdoors). They are young,however, I am thinking to the future. Can I survive with the f/4 or should I bite the bullet and buy the f/2.8. Thank you.
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