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THE F-STOP DOES NOT WORK ON MY SONY A7S WITH MY METABONES EF-E MOUNT


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If your other EF lenses work properly 

on the MetaBones, then the particular 

Sigma lens has incompatible firmware, 

a typical problem of Sigma's reverse 

engineering to avoid licensing costs.  

   

Try a firmware update and if that fails 

to solve anything, it's a dead end. 

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