Conundrum: EOS R v EOS 5D mk IV v EOS R mkii?

The 1DX is just too heavy for me now.

Does anybody know how Canon's dual pixel AF performs, compared to the 1DX (or other good DSLR camera), when the subject is far out of focus? I've read that mirrorless cameras with embedded focusing elements in the sensor have to keep these sensors fairly small, to avoid impacting image quality. Thus they can't figure out where focus is if it's as far out as a 1DX can. The AF sensors in the 1DX are longer, so they can track focus further away from the correct point. Thus they are faster in getting the lens focused, as they don't have to search for focus as much.
But I don't know if Canon combines several pixels into an AF sensor with the dual pixel method? I guess they could, with that technology.

Not particularly well. Hit AF button, wait, nothing happening, Oh OK something is happening just so slow I could not detect it.
I have been meaning to time one of these far out of focus hunts as I'd guess 10 seconds off the top of my head but Shirley it's only 5 or 6 seconds?
Sometimes it does not even try. I'm taking about EOS-R.

The reason I tend to value her opinion over yours is that she has actually used both the EOS R and the IDx. Her opinion is based on fact, not "I read...", "I heard..." or "I would imagine..." But I'll tell you what, the first time I look into a camera bay at any professional sporting event and see a row of pro photogs using an EOS R, I may change my mind. No doubt that day will come eventually, but it's not here now. As for her joining POTN, do you really think that this forum is the ultimate authority on photography? Give me a break.

The facts of the matter regarding action shooting and function:

- The EOS R employs a very large AF box in AI Servo, 4x the size of the AF box in One Shot, and much larger than single point or spot AF of the 1D series. This means in some situations, it will be nearly impossible to get exacting AF on what you want, because the box is so large vs what you get on a 5D4/1D.

- The EOS R has a blackout, so if you are tracking specific things in specific modes, you lose track of reality in between shots, thus losing focus on your intended target.

- The EOS R's firmware and functional backbone is from the M series. It is even more evident now with the RP. The EOS R has nearly exactly the same AF speed and acquisition times as the M50, it has the same exact modes and functions. The EOS R does have an expanded AF set of functions (like assist point mode, etc) and has the 3 sliders to tweak its decision making (taken from the 5D4, 7D2 and 1D series), which is helpful over the M50.

The canon mirrorless lineup (EOS R/RP/M) is better when using fast lenses (faster than f2.8 for example), so when using primes, I can definitely see the EOS R being better with critical focus vs needs of AFMA on a DSLR. Also, it may be that the EOS R drives EF lenses a bit faster overall which also helps. In these situations, the EOS R could indeed be better than the 5D4 or 1D series. The M50 locks onto target IMMEDIATELY with a fast prime, no twitching, etc I might sometimes experience with the DSLRs. That is very nice.

That is where I expect this salesperson to be coming from, and not from a sports or action oriented environment. In regards to the OP needs, the EOS R (or even RP for that matter) is a good body to try out, with BIF potentially being problematic.

Can the mirrorless be used for sports? Sure, but the keeper rate is much lower, and some types of shots that I obtain with a DSLR is impossible with the current mirrorless functionality from Canon. Again, before one sticks their nose in the air about the M50, the EOS R/RP is designed from the M series, sharing something like 90% of total functionality and speed.

I read this thread, (speed-read it is more accurate) and I might add a couple of things:

a) While it is true that the EOS R does not need AFMA, most cameras from 5DIII and newer, have adequate two point AFMA. Even my 60D that didn't have AFMA, never needed it. No need for AFMA is a nice to have, but it is not a life or death point.

b) FPS. If I understand it right, full unimpeded hi-FPS in the EOS R is 3 FPS, bumped to 5 if you accept blackout. 3 FPS is useless, I used to have a Canon Ixus 960IS with 3FPS. I took it to a swim meet trying to shoot my son coming towards me in a butterfly race. Not a one keeper! From over 50 photos, not a one with his arms stretched and his face about to go under. Not one! The 1DxII does 14 FPS if I am not mistaken? I know the 7DII I rented did 10 and it sounded like a sewing machine

c) I like the full time WYSIWIG of the EOS R. No buttons to press, just dial one stop (or a 1/3 stop) up and you see the results right there.

EDIT: Let me RE-EMPHASIZE: You take a photo of the scene as you want it. No exposure compensation based on experience, mode (i.e. select snow, or fireworks, or sunset). You change the exposure/speed as you like it to shoot the photo as you like it. No stop down buttons, nothing.

Reading TS, I am always tempted to buy a M50 . I MUST RESIST!

Ah, I just picked up a Rokinon 12 f2 for the M50, that lens is alot of fun too, pretty creative, you can isolate somebody close if you want, or just focus to infinity and everything 10' out or so is all in focus...

I only have 2 manual focus lenses, but both are very good (50 1.2 and 12 f2) and small.

I bought the EF/EFS adapter from Fotodiox, but haven't used it much. If I put an EF lens on the camera, I am using the speed booster, to give the M50 more of a FF look.

The Godox TT350 is a nice little full featured flash for the M50 too. I have a very small shoulder bag, and can fit 4 lenses, 2 adapters, and the camera in it. It is a great 'take anywhere" kit, when I just want to make sure I have camera gear with me at any time.

So here is a pic of the 100-400II next to all the lenses, adapters and camera... And a camera that has:

- Digic 8 processor
- 10fps
- Rear touch AF point selection
- Tilt/Touch screen
- Silent shutter
- Eye AF
- Accepts EF, EFM and EFS lenses
- Focus peaking
- High ISO MSNR
- Really fast AF acquisition
- Access to speed booster that lowers crop factor to 1.1
- 4K video

I think this is the same list on the FF offerings, isn't it?