Dan Watson has tested some long high-end super telephoto prime lenses on Sony Alpha a9 (Amazon/B&H Photo/Adorama). He uses Sigma MC-11 and Metabones Mark IV as adapters for Canon EF 300mm f/2.8L IS II USM Lens and Canon EF 400mm f/2.8L IS II USM Lens on Sony Alpha a9. From video above, we can see that the Autofocus on Sony Alpha a9 is really great. You can watch the full video above.
Samyang/Rokinon is rumored to announce a new AutoFocus full frame E-mount lens at the second half of this year. Currently, there is no detail on what kinds of FE lens to be announced.
dpreview has completed the full review of Sony Alpha a9 (Amazon/B&H Photo/Adorama) full frame mirrorless camera. It received 89% Gold award at dpreview. One of the best cameras in the world ever. dpreview said that Sony a9 is good for Sports, peak action, wedding, event and newborn photography, photojournalism, while not so good for Landscape and studio photographers for whom resolution and dynamic range are important considerations.
After announcement of two new FE wide-angle zoom lenses several weeks ago, next FE lenses from Sony will be Sony FE 135mm f/1.8 lens and Sony FE 400mm f/4 lens. Both lenses are rumored to be announced together in this Summer. Will be announced before Sony Alpha a7III (Coming in this Fall).
As rumored before, Sony Alpha a7III will replace current a7II in this fall, 2017. Currently, there is no so much specs rumors on Sony Alpha a7 III yet. According to recently rumors on SAR, Sony Alpha a7 III will have a new 24MP full frame sensor, and will have same Autofocus system as on Sony Alpha a9 (Amazon/B&H Photo/Adorama).