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Wondering if anyone here has any experience with the Sigma or Tamron 150mm-600mm telephoto zooms. I'm looking to get one as a first wildlife/bird lens for my D3300. Worth a look? I really can't afford fast primes and quite frankly this is just a hobby. I'm mostly concerned about the auto-focus working correctly. Would something like a Nikon 200-500 be better for the extra money?