Victor Vandevenne Posted November 23, 2017 Share Posted November 23, 2017 So i bought a Sony a7s with a metabones EF-E mount. But when i put my Sigma 18-35 mm f1.8 on the metabones i can not control the F-stop of my Sony?!! Help? Thanks a lot!! Link to post Share on other sites More sharing options...
Username Posted November 24, 2017 Share Posted November 24, 2017 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. Link to post Share on other sites More sharing options...
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