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 […]
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via Patent: Tamron 100-400mm f/4.5-6.3 VC
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