Sigma to Sony Converter MC-11
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Along with the new 50-100 f/1.8 and the 30mm f/1.4 DN announced last night - Sigma has also announced at Mount Converter - Similar to the Metabones and Commlite adapters - this adapter/converter whatever you want to call it allows you to use Sigma's lenses designed for Canon EF on Sony E- Mount with full electronic control. Price is just $249. This is exciting! As A sony owner I also happen to have a few Sigma lenses and can tell you that both the commlite and metabones adapters provide a poor experience with the Sigma lenses - especially the commlite, I wouldn't even call it functioning - loses connection constantly. Hopefully having an adapter direct from Sigma will provide much better results with Sigma lenses.Preorder from B&H Photo for $249.00Full press release from Sigma below.
New Sigma Global Vision Lens Mount Converter Expands High-Performance Lens Options for Sony CamerasBrings Sigma’s Global Vision Lenses to the Sony E-Mount Camera FamilyKANAGAWA, JAPAN – February 23, 2016 – Sigma Corporation of America, a leading DSLR lens, camera, flash and accessories manufacturer, today announced the release of its new high-performance Sigma Global Vision lens converter – the Mount Converter MC 11 – for Sony E-mount, full frame and APS-C sensor cameras. With the new MC-11, Sony camera users will be able to utilize 19 Global Vision lenses in Sigma Canon Mount (EOS) and Sigma Mount (SA).“There are many challenges to designing high-quality mount converter and topping the list is aptly handling phase detection AF in newer cameras and this is where the Sigma MC-11 is groundbreaking in its support for the Sony E-mount systems,” states Mark Amir-Hamzeh, president of Sigma Corporation of America. “The new Sigma MC-11 mitigates complications with a purpose-built lens control data system engineered for maintaining superior AF functionality. So the growing number of Sony E-mount camera users who have been asking for more lens options, now have access to a large pool of lenses that fully embody Sigma’s signature quality and performance.”The Sigma MC-11’s sleek LED display lets Sony users know if the attached Sigma lens is compatible and whether or not the MC-11 needs to be updated for that specific lens. Its internal control data system keeps detailed information on each compatible Sigma lens, automatically optimizing performance of AF drive, aperture control and other critical lens functions. The MC-11’s internal control data system also maintains continuity with key camera functions that control brightness and correct transverse chromatic aberration, distortion, and more. The complete compatibility with both Sigma lens OS and Sony in-camera OS ensures correction of camera shake and other stability issues and when used with in-camera stabilization, MC-11 allows angle shake correction in the lens. The integrated flocking helps prevent internal reflections and reduction in lens performance. In addition, the MC-11 retains important EXIF data ensuring users can analyze every detail of their lens setting.The Sigma MC-11 converter can be updated with the latest compatible lens information from a workstation or laptop using the Sigma Optimization Pro software and Sigma USB Dock (sold separately).For information on the Sigma MC-11 converter please visit www.sigmaphoto.com/mount-
The commlite doesn't feel exactly cheap in the hand but it does feel a little less substantial, the sound is cheaper, tinnier and I have found that with the sony adapter the lens lock pin sticks, so you often need to manually slide it forward or the lens will not lock in place.
The tripod foot is less secure and becomes annoyingly loose at times and I found it difficult to tighten once the camera is attached to a tripod or tripod plate. The EF to MFT doesn’t have a tripod foot at all and the lens lock pin never seems to stick, always working correctly. One more important point - the Metabones adapters have a micro USB port for firmware updates and in the case of this EF to M43 Speedbooster I have, that allowed me to easily upgrade the firmware and I now have autofocus capabilities when I didn’t before! As far as I know there is no way to upgrade the firmware on the Commlite adapters.
Performance - with the Metabones EF to Micro four thirds adapter, performance is very good- I have used this setup with a variety of my canon lenses over the last 8 months and never had a single connection issue or error. With the new firmware update I now have autofocus and it works well albeit slower and less sure of itself compared to native, MFT lenses. I can’t say the same about the performance of the Commlite - I have only had it a few days but It fails after just a few seconds with almost all lenses - when it works longer than a few seconds there are AF capabilities but aperture is zeroed out and trying to change aperture or taking a photo causes the connection to fail.
Clearly something is not working here and I have reached out to the company. Check back for updates. The EF to E Commlite adapter actually works, and with some lenses Autofocus is just as good as with the Metabones but when you compare the complete list of lenses I tested using the two adapters, the Metabones performs better with a greater number of lenses.
To be fair both offer a list of compatible lenses so you can check to see if the Commlite or Metabones will work for you but it was apparent that when the same lens is on both lists the Metabones will offer slightly faster and more consistent focusing. The Commlite and any lens combination never outperformed the Metabones but with the 
