07-13-2016, 02:07 AM
The speed is likely to be slower than the 55mm Zony as the new ens uses a ring USM motor and large focusing elements. The performance will probably be more closer to the 85mm 1.4 GM, which is slow in practice. It is interesting how the Sony large prime mirrorless lens design use ring USM, I guess a small focusing element lens design has too many compromises compared to the traditional unit focusing approach. That is a shame though as the unit focusing approach is typically slow.