Great tool for the Sony A7Mii
Crutchfield Customer Review (What's this?)
If you have A-Mount lenses and would like to use them on your E-Mount body, this is a "must have". It especially works well with the A7Mii, which as image stabilization built into the body. In use, the experience is similar to the one you get when you shoot with the Sony A99. The autofocus is fast and accurate, as long as you don't try to focus out on the fringes, since the focus points don't stray far from the middle area. Until Sony comes up with an adapter that uses their "4D" technology, this is the best adapter they make. You can use it with all the E-Mount bodies, but only the A7Mii will give you image stabilization, unless your lens has it (I think the only A-Mount lenses that has stabilization built in are some of the Sigma ones, but I have no experience with them). Lenses I have tried with it: Tamron 90mm Macro (the old design), Sony Zeiss 50mm 1.4, Sony 70-400mm G Mii, Sony Zeiss 24-70mm, and Tamron 70-200mm 2.8 USD.
Pros: Turns your E-Mount mirror-less camera into a translucent mirror camera and allows you to use A-Mount lenses. No image degradation that I can see.
Cons: No built-in image stabilization, unless you have the A7Mii (or any future models that might come with in-body stabilization). Also, with cameras like the A6000, you will not get some of the features available that you get with native E-Mount lenses, and will reduce the auto-focus areas (which will be concentrated more in the middle section).