According to the Egami Blog, Tamron has patented the optical formula for a 70-200mm f/4 VC lens.
Description of Patent
Description of Patent
- Patent Publication No. 2016-126278
- Published 2016.7.11
- Submitted 2015.1.8
- Focal length 71.8092 109.9915 205.9615
- F-number 4.0989 4.1033 4.1023
- Field of View 16.7567 10.8972 5.8621
- Inner zoom
- Inner focus
- Vibration control
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