I am in charge of firmware at Metabones and I would like to give an official response with regard to GX80/GX85. We do not expect any EF mount to be able to take advantage of Dual I.S. in the foreseeable future. Either OIS or IBIS should be used, but not both. Andrew reported that "They seem to both operate and ignore each other, leading to problems." We could confirm that it is indeed the case when we downgrade to 1.4 or before. This was fixed in 1.5 a long time ago (Feb 2015). It is easy t