So I just got my Sigma MC-11 today and tried it on two lenses, my Canon 70-200 2.8 IS Mark I and Tokina 300 2.8 on the a6300. It works very well on my Canon 70-200 2.8 IS Mark I. There is a little hunting but not bad at all. If you put the the focus limiter on, the hunting is almost gone completely.
On the Tokina 300 2.8, I was surprised it worked as well! Keep in mind the Tokina 300 2.8 is an older lens. I used it on my 5D3 and it autofocused decently quick (not lighting fast) with a slight noise due to focus motor of lens. On the a6300 with MC-11, it's s bit slower and hunts more than the 70-200 2.8 IS I, but still useable for portrait work and general shooting. A trick I use for it to focus faster is to prefocus close to the desired point and it locks on quickly using AF-S and AF-C. I even tried a Kenko 1.4 DG X teleconverter and works great on both the lenses. I will post images and video soon.
bjornthun wrote:
You will have to judge for yourself if the AF-C on the Sigma 150-600 C is good enough for your own shooting, as things stand now. I think it can work only for very easy and simple tasks.
I tested the 150-600C on my a6300 and a7rII. Latest firmware on everything: bodies, lenses, adapter. AF-S is just fine. AF-C is not, it "works" but not great. In fact, the camera was showing me that the objects were in focus but the resulting photos were not sharp! I was shooting a male adult riding a bicycle, in a serpentine path. Plenty of light, shutter speed really fast, still not sharp images, with either the a6300 or a7rII.
Too bad, I really really wanted this combination to work!
I returned the Sigma and bought the Canon 100-400 Mark II with the Metabones MarkIV adapter. Did the same tests with both bodies, a6300 and a7rII. Sharp and in-focus images using AF-C. Quite fast response time, too. Great tracking.
I got MC-11 with 35 1.4 Art a few days ago. On A7R2 (FW 3.2), AF-S is slow, but AF-C is quick and accurate, it feels like AF-C uses phase detection.
The aperture does not close down properly though. When selected aperture is smaller than 1.4, the lens closes down aperture little by little, creating a lot of noise. On A6300, aperture closes down directly to selected value.
Chris Cheng wrote:
I got MC-11 with 35 1.4 Art a few days ago. On A7R2 (FW 3.2), AF-S is slow, but AF-C is quick and accurate, it feels like AF-C uses phase detection.
The aperture does not close down properly though. When selected aperture is smaller than 1.4, the lens closes down aperture little by little, creating a lot of noise. On A6300, aperture closes down directly to selected value.
I found that AF-C with "Expand-Flexible Spot" gives the best AF performance with this combo (A7RII + MC11 + Sig35Art. AF is near instant and very accurate Eye-AF also works well, even in low light and subject placed in the near corner of the frame.
ThanhHa wrote:
I found that AF-C with "Expand-Flexible Spot" gives the best AF performance with this combo (A7RII + MC11 + Sig35Art. AF is near instant and very accurate Eye-AF also works well, even in low light and subject placed in the near corner of the frame.
I actually like the performance of the adapter, thinkking of trying it with 18-35. AF-S is slow and unreliable but at least AF-C is quick, which is good for me as I just use AF-on...
I found Lock on AF is not so reliable, but then again, lock on AF is not so reliable even with Sony's native lenses
Here is a quick snapshot of my A6300, MC-11 and Tokina 300 2.8. AF is very usable and decent in good lighting. While it hunts more and sometimes has a hard time locking in low light, pre-manual focus to help get it near the desired focus points helps it lock. Again, this lens has an old design, would also hunt and was never lightning fast on my 5D3, so to say the AF works and is usable for a good amount of scenarios as an adapted lens on a Sony is still impressive. Here is quick test of the autofocus. Pics taken with the conbo coming soon.
I tested many lenses of lenses last year with MB lll and lV adapters. Older lenses usual had significantly better AF then newer (Series ll) lens. My theory is focusing algorithms have become more complex and the non-Sony FW of the MC-11 and third party adapters can not keep pace.
I had an MC-11 and 2 Sigma lenses with the latest FW available, both for the lenses and MC-11(1.01). I tested them on 7RM2s with FW versions 3.00, 3.10, and 3.20. The functionality of the Sigma MC-11 and lenses degraded with each FW update of the 7RM2, needed for the GMs, and Apps.
I did not have my 6300 with at the time, as I was traveling. I am concerned that the MC-11 may work well with the 6300 FW version 1.00, but may not work well with Sony's next FW update.
For anyone who still owns the Canon EF 200/1.8L, the MC-11 works great with it. It snaps focus very quickly and AF-C works as well. AF performance is way better than Sigma's own 150-600C. If I could use EyeAF with this lens, it would be heaven.
Fred Miranda wrote:
For anyone who still owns the Canon EF 200/1.8L, the MC-11 works great with it. It snaps focus very quickly and AF-C works as well. AF performance is way better than Sigma's own 150-600C. If I could use EyeAF with this lens, it would be heaven.
The 200 1.8 was my favorite Canon lens! Does it work with a TC?
Isn't it funny how LR reads the lens data as a DT series lens. I noticed this testing the MC-11 several months ago.
I had to research whether or not Sony had made a lens in a certain focal length that I was unaware of.
Here is a quick sample using the Kenko 1.4x MC4 Teleplus extender + crop mode. (handheld)
It's 420mm equivalent. (Canon 200/1.8L + 1.4x extender + 1.5x crop mode)
It's about 18MP on the A7RII.
Wide open is a little hazy but at f/3.2 it's pretty good. AF was also quite fast with the Kenko extender and I assume it could be even better with the Canon 1.4x extender.
Eye-AF also works well, even in low light and subject placed in the near corner of the frame. 
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