Desperately seeking birds
- Aug 16, 2012
Thanks for the heads up! My 150-600mm C was packed up along with its TC and the Sigma Dock to be sent off tomorrow for sale as the AF was too slow on the R5. I upgraded the firmware and preliminary observations are that it has been radically speeded up. Further tests tomorrow. Whatever the complaints about Sigma, their introduction of the Sigma Dock and their subsequent willingness to provide firmware updates are highly commendable.
Confirmed this morning. The Sigma 150-600mm C on the old firmware version was fine with my 5D series but slow AF with the R5 and hardly worked with the 1.4xTC. Upgrading to the 2 series firmware has fixed the problem. The AF with the 2xTC is quite as acceptable now, but not as fast as the 100-400mm II with the 2xTC. So, Sigma owners, get out your Sigma Dock for the R5. (The upgrade from 1.03 was recommended previously for use with the Sigma MC-11 adapter for Sony, which is why I hadn't bothered). I'd say the IQ in the centre at 840mm with the Sigma is about the same as the Canon at 800mm, but the Canon has edge-to-edge sharpness whereas the Sigma is a little softer at the edges.