No AF, but no problems. With focus peaking and MF Assist on Sony A7, its still relatively easy to zero in on a razor sharp depth of field. The Canon EF 50mm F1.8 has admittedly a very indeterminate manual focus. But, once disengaged from the AF mechanism, it still moves freely. Great way to utilize Canon EF glass. Primes are still the best way to fully utilize the capacity of this sensor. Next step, legacy FD glass. Stay tuned.