Sigma 35mm HSM ART Autofocus on RF

MasterWayne wrote:

antonio-salieri wrote:

I don't have the 35, but I have a number of Sigma Art lenses and they all focus pretty quickly. But note that the Sigma Art lenses can be hooked up to the dock and one of the settings you can change is focusing speed, at least for some of them. Not sure about the 35.

Interesting, thank you, I wasn't aware of that.

By any chance, do you know what default value the lenses are programmed to, usually ? Is it the quickest?

Again, not sure about the 35, but I believe the default value is medium speed, to be a balance between accuracy and speed. But on mirrorless faster might be about as accurate.

I have never used the 35, but the 50 is about the same age and focuses fast for me on my R5. It's also possible the copy you tested at the store was off.

Apparently one of the firmware updates for the 35 dealt with a slowdown glitch in continuous AF. So that could be it, too.

For all Sigma GV (Art, Sports, Contemporary) lenses, you can use the USB dock to adjust settings and update firmware. Firmware updates are infrequent, but of course can be useful. Also, note that firmware 2.0 for the early art lenses (such as the 35) added support for in-camera corrections on Canon cameras. It's a little awkward to need to get the dock, but it's definitely somewhat useful. It can also be used to calibrate focus accuracy, but this is only relevant for DSLRs. (Also, note that IBIS will only work if you turn off the full time MF override setting. You can still manually override, but you can't do it while holding down AF, if you want IBIS enabled — weird quirk, but not a problem, as I just have a button mapped to prevent AF, and can MF anytime that way; similarly, if you use BBAF, it will always work with IBIS and MF override)

All I know is all my other Sigma primes work great on the R5. Though maybe I'd want a different individual copy than the one you tested!