I'm eyeing an 80-200 2.8D push-pull screw-drive AF that's priced right (under $300), but was a bit confused on whether it belonged in my kit (D3300 and D7100, with 55-200 VR & VRII, as well as manual fast primes (105f2.5, 135f2.8, and 180f2.8) that cover the range). I expect to use it mainly for...