300mm F4 + TC1.7 or Tamron 200-500mm for sports

I used to use Tamron 200-500 for BIF,, and eventually sold it and now use 300 f/4 AF-S with 1.7TC. No problem at all for fast auto focus using the D7000 with AF-C. The Tamron is lighter and the zoom is nice, but image quality is sharper and better with the Nikon.

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Richard (rb_stern),
www.pbase.com/rb_stern
richard-s.smugmug.com