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.