70-300mm Nano USM or Tamron 100-400mm for Sports?

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aloli Regular Member • Posts: 258
70-300mm Nano USM or Tamron 100-400mm for Sports?

Anyone has used both the Tamron 100-400mm and the Canon 70-300mm Nano USM and can comment on the difference in autofocus performance and image quality between them?

I'm looking at a replacement for my 70-200mm f2.8 on my 7D, love the f2.8 aperture but its just not enough reach for my sports stuff anymore. The 100-400mm was my first thought as it doubles my reach at the long end, but I've often been frustrated by the slow AF on my Tamron 70-200 VC and wonder if the Nano USM of the 70-300 may help my hitrate significantly.

 aloli's gear list:aloli's gear list
Canon EOS 7D Fujifilm X-E3 Fujifilm XF 18-55mm F2.8-4 R LM OIS Fujifilm XF 35mm F2 R WR
Canon EOS 7D
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