j4nu wrote: Ayoul wrote:
Nice comparison. The 20 1.8 in APS-C mode seems indeed a bit smoother in the bokeh, and has less Loca.
I could try the af-c of the Sigma 35 on a moving subject yesterday, on a guest in my garden which likes to visit us sometimes.
Of course, she didn't move very fast but all cat owners know the tendancy of this little fur balls to get immediately very, very close every time you point a camera at them (you know, whith this look in the eyes which means : "if I was 80 pounds heavier I would eat you"). A9, af-c, small flexible spot (neither real time tracking activated or animal AF). The first picture was the closer she gets while maintaining a sharp picture around the eyes wide open.
So, what's your overall impression of tracking in AF-C?
There is an ongoing debate here that all Sigma stepper motors are bad (significantly worse than Sony native lenses) at tracking (so the whole I series).
There were also people returning the lens because it coulnd't keep up with their kids. On the other hand, when I had it, I didn't notice any major AF slowness (and managed to take snaps of my kids with a similar success rate as Sony lenses), but I didn't really test tracking (e.g. multiple shots of something coming towards the camera)...
Honnestly, I think that the af-c looks good enough. I've been pleasantly surprised by the AF speed, accuracy and silence of the Sigma 35. It may be slightly slower than the Samyang(s) that I returned for a tilted focal plane, but it's perfectly usable. Honnestly not significantly worse than my Zony 35 1.4. (When I bought it a few years ago, despite its flaws, I was impressed by the speed and silence of its AF).
It may just be a tad less accurate at short distance when taking still subjects, but it may just be my imagination.
But before I took the picutres of this cat, I never took any challenging subject moving toward me with it. I may have been lucky but it did the job very well.
Precision : 99% of the time I use af-c with small flexible spot, in fact like a good old DSLR, without real time tracking. I think that it hurts a little bit the accuracy of AF sometimes. I turn eye/face af on or off depending on the situation. It can hurts accuracy as well sometimes. In dim light and backlight, face AF looks sometimes more like a hair-around-the-face AF than anything else...
