I have tested the Sigma Mc-11 with Canon EF 24-105 f4 IS USM and can confirm that the automatic IBIS does not work at all ( greed out ). When you switch the lens IS, manual IBIS is available, so you can select the FL but then you get the double stabilisation, which causes terrible corner smearing. Also, with zooms using this adapter it is completely impractical as you have to manually change the FL every time you zoom in and out.
I've send the Sigma back, Metabones is the only adapter that allows proper stabilisation with CanonEF IS lenses.
This is only a bit relevant to the topic but I've had no trouble with len's stabilisation and IBIS using my Viltrox adapter. If both of them are enabled then it would over-compensate and cause blurry picture, but I can enable
either of them (i.e., leaving only the lens' OS enabled or the camera's IBIS enabled, they can be toggled independently of each other).
Edit: with the Viltrox adapter (and probably others such as MB) the camera knows about the lens' current focal length so IBIS works properly, I don't need to set the FL manually.
Hey, thanks for that info. I found the Sigma adapter completely useless with Canon IS zooms but the AF ( PDAF enabled ) was very fast and accurate. I can't believe Sigma have released this adapter without sorting out the stabilisation issue, which as someone above reported conflicts even with their own lenses.
How is Viltrox as far as AF concerned ? Which Canon lenses do you use with it?
I don't have many Canon lenses but have tested a couple of those. The lens I'm using with it most often is Canon 24-105mm f4. According to Brian Smith the Viltrox adapter's compatibility is on par with the Metabones as far as AF is concerned:
http://briansmith.com/sony-a7rii-canon-ef-smart-adapter-tests/ . However in terms of IS support it seems to be a notch above (mainly because we don't need the latest MB4 adapter for the IS switching stuff).
Please note that the IBIS support has not been tested extensively elsewhere and I can only provide my anecdotal evidence. Would be nice if someone else could chime in.
The Canon-mount lenses I've tested with are: Canon 18-55, Tamron 18-200, Sigma 105 macro (film-era, AF not working), Canon 24-105, Sigma 70-200 f2.8 (film-era, AF not working), Canon 28-70 f.35-4.5 (film-era, AF not working), Tamron 70-200 f2.8. Except the ones noted, all lens AF work as expected and snappy on my A7II.