Tamron has filed a patent for a 100-400mm f/4.5-6.3 VC optical formula. Such a lens would likely be a smaller and cheaper competitor to the Canon EF 100-400mm f/4.5-5.6L IS II.

Patent Publication No. 2016-126295 (Google Translated)

  • Published 2016.7.11
  • Filing date 2015.1.8
  • Focal length 103.00 247.29 389.05
  • Fno. 4.51 5.81 6.53
  • Half angle of 11.68 4.88 3.11
  • Positive and negative positive negative
  • Rear focus (Group 5)
  • Anti-vibration (third group)

We haven't heard much about Tamron's plans for Photokina, but we do expect some major announcements from the company.

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