I have 5 Canon EF mount lenses which I use on my a7RM2 by means of a Sigma MC11 mount adapter. The adapter is plainly marked "for compatible lenses only." which is their way of dodging complaints.
Of the 5 lenses, 3 turn off Steady Shot and 2 allow it to operate. My Rocky Nook textbook on the camera tells me that the work-around for thus problem is to turn the Steady Shot to "Manual" and then select a lens focal length for it. Can't do this is the Steady Shot menu is greyed out and unavailable with these 3 lenses.
Any ideas out there for a "workaround?" I'm going to sell the Canon 16-35 F4 (one of the 3 that block Steady Shot) and get a native lens if I can't find a way to have Steady Shot.