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This is my first post on this forum site. I am new to photography and have owned a couple canon dslr cameras (EOS 40D and 70D). Forgive me for my formatting. just got a used Sony A7R ii, which worked perfectly according to the previous owner who sold it on craigslist in pristine condition with all documentation purchased from B&H. I saw it autofocus and take pictures with his own native E-mount lens, which he was selling, albeit at a $1500 price point, and I was already a little hard pressed for cash. I did not have a lens, so I went ahead and purchased the Sigma 35mm f1.4 ART lens with the canon EF mount. I needed some kind of adapter, so I also bought the Fotodiox Pro Lens Adapter from Amazon. I read on this site: http://briansmith.com/sony-a7rii-canon-ef-smart-adapter-tests/ that the Fotodiox adapter should perform alright with the Sigma lens. Once I received everything (today, May 26th), I mounted it all on and took my first picture. Autofocus was... nonexistent. Second shot in better light proved more promising with pretty snappy autofocus. Then I tried to take another photo and when I pushed the shutter down, the screen turned true black and then the "artificial black" for about 5 seconds. When it returned to normal, there was an audible "clicking" or "readjusting" of the whole system. I took the lens and adapter off, put on the lens cap, and I was firing away normally, so it leads me to believe that the lens or adapter is causing some kind of lag. This happens in both manual and autofocus modes. It seems to happen randomly, but it happens more than 75% the times I have tried to take photos. It also happened a couple times when I pressed the shutter half-way. I also thought it could be my SD Card. I am using an old SDHC I SanDisk Ultra 30 mb/s 8gb card. I have a 64gb Lexar 1000x 64gb U3 card coming in a couple days from Amazon.