rscheffler
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armd wrote:
Can't tell you why you are experiencing "pulsing" with this lens combination as I haven't heard about this before. If there is a problem with the lens or communication, then buying an R3 won't solve the problem. The biggest differences that you are likely to experience between your 1dxiiii and R3 are the lack of viewfinder black out and need for MA. I used my 500 f/4 IS II extensively with a variety of bodies and never experienced pulsing.
You don't see the pulsing happening while shooting. It's not that the camera/lens combo is rapidly focusing in front and behind the subject like some contrast detect AF systems do (Panasonic's DFD). It's rather the way the DSLR system drives the focus motor between exposures. IIRC focus drive actually stops at the moment of exposure, then resumes with the predictive AF driving the focus to where it thinks it should be next. So apparently it's constantly playing a catchup game after each exposure and sometimes it's a little in front or behind. Also, the AF sensor is not the imaging sensor, so other physical factors affect AF performance/accuracy/consistency, such as ambient light color temperature, ambient temperature (hot/cold), condition of the sub mirror system, if there's dust/dirt on the AF optics, etc.
Prior to switching to mirrorless last fall, I shot with the 1DXII since 2016, the 1DX prior to it since ~2012, the 1DIV prior to it, etc.. and as resolution crept up with these bodies, it became more noticeable that focus throughout sequences would 'flutter' a bit around the point of perfect focus, but would usually still be in the very acceptable range. Often you'd have to pixel peep to really see the differences. But sometimes it would be pretty stark where a few images would really pop with perfect sharpness while others looked just slightly off (but still generally acceptable).
I see much less of this with the R6II, though it's also not perfect shot to shot. But I have 40fps sequences of fast moving athletes where virtually every frame is very good and very consistent in respect to technically correct focus.
Another factor could be atmospheric distortion. My experience is primarily with field sports where more and more games are now on artificial (plastic) turf that acts as a heatsink on sunny days, and in turn radiates that heat vastly more than natural turf fields. The massive heat waves coming off artificial fields can dramatically degrade image sharpness and is worse the longer the lens. Over the years I've found that DSLRs (my experience was specifically with Canon's 1D series) had a difficult time finding correct focus through the heat waves (at least as good focus as would be possible in such conditions). This still negatively impacts mirrorless but with the R6II the focus in these conditions doesn't appear to fluctuate as dramatically.
This also translates to motorsports where often the races are on hot sunny days. The (road racing) tracks of course are concrete/asphalt that also absorbs and releases a lot of heat in such weather conditions. And it equally wreaks havoc with AF consistency and image sharpness. It's possible the OP is partly experiencing this, combined with the nature of DSLR AF.
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rscheffler wrote:
For example, ice hockey slap shots with the 1DXII, I could usually time it to get the moment the stick hits the puck in a single shot. With mirrorless EVFs, I find I have to shoot earlier than I expect to. The solution really seems to be to just 'spray and pray' in such situations.
amacal1 wrote:
I wonder if this is just generally due to the performance differences between 1 series bodies and pro-sumer level bodies. When looking at lighting trigger options, I remember once seeing a list of camera bodies and their shutter release delay times and the 1D bodies were faster than all the others, including the 5D series. I wonder how the 1DXIII compares against the R3 and also against the R6 in that specific metric? (i.e. time between engaging shutter release button and actual shutter release)
I think it's somewhat due to the R6II being a 'prosumer' class body. The shutter release feels squishy compared to my old 1DXII, which was much more 'hair trigger' in its response. The first mirrorless Canon I tried for sports was the R3 and even with it I still felt some disconnect between pressing the shutter release all the way and the moment of exposure. It's difficult for me to describe other than the 1DXII felt very decisive. I knew its timing and often could get the moment I wanted in one shot. I haven't yet nailed down the R6II's delay. It might not be so much the shutter release, but as I suggested before, its EVF lag. In theory it would be great to just use the pre-release RAW burst mode in these situations, but for me, its implementation is suboptimal. Maybe eventually Canon's pre-release implementation will get to the point where the camera is able to constantly capture full-rez files and simply writes those as normal, individual files from 'x' time prior to fully depressing the shutter release. It sounds simple, but apparently it's not that straightforward for Canon.
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