Focusing speed and continuous shooting Sony a9 dramatically decreases when using the camera with high-aperture telephoto lens Canon
Reading specifications mirrorless camera Sony a9, aimed at professional photographers, some owners of classic telephoto lenses Canon EF 300mm F2.8L IS USM and Canon EF 400mm F2.8L IS USM, used for sports reporting, possibly mentally tried them on a new camera that can shoot series at a rate of 20 K/s without darkening the viewfinder and up to 60 times per second to adjust the focus while tracking the focus.
Check the operation of these kits came from Dan Watson (Dan Watson) from Learning Cameras. For mounting Canon lenses on the Sony camera he used adapter Sigma MC-11 and Metabones Mark IV.
The results were disappointing.
First, the speed and focusing accuracy drops significantly when you select focus points remote from the center of the frame.
Secondly with adapters available only burst mode L. the Actual speed is a modest 2,5 K/s.
In other words, practice has shown that the idea of using the Sony a9 with the high-aperture telephoto lenses Canon for shooting sporting events can put a cross.
Unfortunately, the selection of their own telephoto lens for Sony a9 is still limited to the model of the Sony FE 100-400mm F4.5-5.6 GM OSS (SEL100400GM), submitted in April and expected in stores in July.
Source: DP Review