It looks like Tamron continues to put resources into developing APS-C superzoom lenses, they must be a good revenue stream for the company. The latest patent shows an optical formulas for a 13-200mm f/3.5-6.3 VC and a 16-300mm f/3.5-6.3 VC, which would easily be the widest APS-C superzooms on the market. I doubt both concepts would get made, but there's a good possibility that one will.
Patent Publication No. 2015-118214
- Published 2015.6.25
- Filing date 2013.12.18
Read the whole patent at the source link below.