Is there a reason Tamron and Sigma dont adapt their zooms to E mount?

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kevindar
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Is there a reason Tamron and Sigma dont adapt their zooms to E mount?
2 months ago

there is a paucity of quality lenses for e mount, and certainly no good 2.8 zoom.  both sigma and tamron make stabilized 2.8 zoom lenses for under 500 for aps-c mount.  Is there something very complicated about flange distances, and mount that makes creating these lenses in E-mount so difficult?  I would certainly drop the 500 to pick up the optically excellent sigma 17-50 2.8 OS lens, or the tamron  VC or non VC version.

Any thoughts?

 kevindar's gear list:kevindar's gear list
Canon EOS 5D Mark III Canon EF 85mm f/1.2L II USM Canon EF 16-35mm f/2.8L II USM Nikon AF-S Nikkor 14-24mm f/2.8G ED Canon EF 70-200mm f/2.8L IS II USM +21 more
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