Sigma MC-11 Mount Converter Lens Adapter (Sigma EF-Mount Lenses to Sony E Cameras) with Altura Photo Essential Accessory Bundle

First off DigitalGoja thumbs up for bundle. Fast shipping. For the price you can buy it on other sites you get a few extra goodies. The pouch is nice to have since the mc-11 doesn’t include one. Also they are a Sigma dealer so no issues registerproducts.The converter snaps on and doesn’t feel cheap or flimsy. Feels solid with lenses attached. This converter can be updated by Sigma as well as their art lenses. Remember the mc-11 is made specifically for their line of lenses. I called tech support to ask about Canon glass and was told some will work and some won’t have all their capabilities available. Same with other camera systems like the Nikon FTZ adapter for their Z cameras not all lenses will convert over with all functions. Sigma made this for their lenses, and I haven’t had an issue using their lenses on my Sony A7iii. Just like meta bones and other adapters they all won’t work with all Canon glass. There is no adapter that will do 100% crossover.I have tried Sigma’s Art line 14-24, 24-105 and the contemporary 150-600. They all work flawlessly. Reviewer above talks about what he believes to be an issue between 150-600 contemporary lens. The lens can be programmed through usb and adjust autofocus. Also want to make sure to update lenses, and mc-11 to latest firmware. I have had no issues with it focusing especially in modes I programmed for wildlife focus.

It maintains autofocus across all of my EF mount lenses (24-70, 70-200IS Mk i, fisheye, 50mm, etc...) and sigma lenses. The AF seems to be on par with the speed of the 28-70 kit lens of the a7iii, but I feel the pictures are actually sharper than my Canon bodies, despite going through a lens converter. The converter itself feels well made and stout. Although, having a large L telephoto lens on it does make me nervous as the camera is tiny by comparison. Definitely learning to hold the rig by the lens to lessen any pressure on the threads.

Being able to adapt Canon ef-mount lenses to Sony E is great. I came into a Canon 70-200 for free and being able to adapt $1,000 lens for only the hundred or so bucks this cost was great. Autofocus was pretty darn fast, but not quite as fast as a native E-Mount . Would highly recommend. Works fine with non Sigma e-mount lenses.

Bought this for switching from Canon 6D & 70D to A7R3 as I own number of canon and sigma lenses. Came updated to the latest firmware.Sigma 35mm Art: Works flawlessly, all focus modes available, very fast focus. (If everything worked as on this lens I would have given 5+).Sigma 150-600mm C: This one is kind of 'meh'. All focus modes available, but at 550-600mm it focus-hunts all the time in AP-C mode, very annoying. Focus mode (phase detect vs contrast) is grayed out on this lens, unsure which one it uses, but its rather slow. Worked much better on 70D.Canon 70-200mm II: Only few focus modes are available (Wide, Center, Flexible spot). No AF-Lock. Focuses almost as fast as on Canon, sometimes focus hunts at 200mm. I would give it 4.5 stars, -0.5 for not supporting advanced focusing modes (af lock etc..)Canon 16-35mm: Works fine, also only few focus modes are available.Canon 100mm L Macro: Works fine, also only few focus modes are availableEye focus worked on all above lenses more or less fine.All in all, works as expected; 1 star taken out for Sigma 150-600mm C lens which I would expect to work similarly to when mounted on Canon.

Just switch to Sony System and I am glad I can use my Canon glass. I don't have any Sony glass yet, but I tested the MC-11 adapter with my Canon 24-70mm 2.8 and it works fantastic. AF-C is very responsive. I don't see a difference since I am using a Canon lens. It does focuses very fast. Eye tracking works great. Also, for those people that say you lose a stop, you do not. Very happy with the purchase. I would recommend this to people like me that want to transition to Sony without having to spend thousands to start.

Bought this used from Amazon but it was missing the cable. Amazon stated that the box was damaged. The replacement cable was cheap otherwise I would have returned it. Once I was able to update the firmware, it works but not without some compromises. It's performance is much slower than that of a native E-Mount lens. I was using a full frame Canon lens with this converter. Sometimes it made my A7III "hang" and it wouldn't turn off or the lens was really slow to respond. If you own Canon lenses and want to be able to use them, buy this product used to save yourself some money, other wise I would stick with native E-mount type lenses. There are too many compromises that makes it a bit a clunky to work with.

Just bought this to use my sigma ef 35mm 1.4 on my sony a7iii. Autofocus works well but is a bit slower than the sony version, which is expected. Great product!

Maintains full AF capability with my a6500 and sigma 18-35 f1.8 lens. It's a tad noisy as others have pointed out (I recommend watching a youtube video about this so you can really see) however it's very usable. And in case you were wondering... Yes, continuous eye AF does work on the a6500. And very well if I might add.Also, I have tried this with friends 70-200 f/2.8 IS, 16-35 f/4, and 40mm pancake and it they all worked very well. I know it's not guaranteed for non sigma lenses, but in this specific case, it worked well.