Sigma 56 F1.4 on M6II versus RF 85 F2 on R

thunder storm wrote:

Alastair Norcross wrote:

thunder storm wrote:

Alastair Norcross wrote:

I've never experienced anything like that with the RF 85 on my R. Do you think it's peculiar to the R5?

It's mainly with AF face/eye tracking at speeds and/or in situations needing "stickyness" the R can't handle anyway. Now that might seem challenging, but my Sigma lenses don't have these kind of problems on the R5, while these are third party lenses in stead of OEM brand native RF. It seems somehow AF speed is prioritized over stickyness to the subject. Now there isn't a whole lot of speed to trade here, however, I do prefer stickyness to be main priority, and speed the secondary. Or, even better, gimme a setting to tweak these things.

Can't you tweak them in camera?

You've got me thinking. I've reduced the number of used C-modes to one, so I have 2 C-modes left. Maybe I should use those for several AF tweaks.

The low light jumping though was the same on the R. With low light the AF can jump even with moderate movements.

When using the IS at full extent there's not a whole lot of light as the IS is very good, and then it even doesn't take any movement to get hunting AF. Still, my EF 24-70mm f/2.8 mkII doesn't hunt in the exact same situations (on a tripod), while it is actually a stop slower and isn't a native RF lens.

It's possible I haven't used it in those situations. Probably the lowest light I used it in for moving subjects was stage lighting, taking rehearsal shots. It had no problem sticking to the eyes of moving actors, in lighting that varied quite a bit (it was a rehearsal, so the lights were all over the place).

Rehearsal.... of a Bach choir, or rehearsal of break dancing?

LOL. It was something in between the two. It was a traditional sword dance with 6 dancers performing a fairly intricate dance with plenty of movement, but at a walking pace. There was a fair bit of change of direction, though, and heads moving up and down.

Otherwise, I've used it for fast runners in good light, with no problems.

Runners have their faces hided sometimes, but they don't make turns and run in one direction at a relatively constant speed.

Skaters on a half pipe is another story. Kids in a playground is also more challenging. Faces are turning away, movements are fast sometimes and the direction of movement is unpredictable. There's also other kids or things in the way. One of the reasons I dropped the money on the R5. It works pretty well with a lot of lenses, but not my only RF lens, at a great focal length and not a whole lot of impact in the bag.

I will wait if the next AF firmware update will bring any good to the table. The next step is tweaking AF settings (this can be quite time consuming I'm afraid) and write good settings for this lens to a C-mode. If nothing works I might sell it.

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45 is more than enough, but 500.000 isn't