R7 and CANON MOUNT ADAPTER EF-EOS R 0.71X - Consensus working?

KevinRA wrote:

I've done some searching - and it appears the Canon MOUNT ADAPTER EF-EOS R 0.71X seems to work fine with the R7 - but very few reviews/reports - one here:

https://www.youtube.com/watch?v=t8mWggxotN8

Appreciate the answer is get the R6 in many instances not this adapter for R7 - but wondering if users out there have more experience of it - good or bad? Functional without issues?

I'd use it with the EF 70-200 f/2.8 II primarily on R7 or R10 - if my R5 had another lens on it and small in the bag.

I've used the Viltrox adapter with precisely this lens as my workhorse for shooting basketball all winter and it works very well.  The primary goal is to shorten the focal length so I can use one lens on both ends of the court.  50-140 on APS-C -- roughly 80-220 full frame -- works nicely.  I tested it at home on a static subject, and at all focal lengths the result was still very sharp.

There's no evident AF problems as a result; AF doesn't hit every time, but it didn't with the RF 100-500 shooting football and soccer either.  Once in a very great while (maybe once every 2000 frames or so) I get an error 20 and the camera reboots.  I can't say for sure that I never had that with the 100-500.

Of course, there's the question why I didn't get the R5 or R6 to begin with.  For one, I'm used to the crop sensor, and it works much better for football and soccer with the 100-500.  I also have the 17-55.  The R5 is much more expensive; the R6 is also quite a bit more expensive, has fewer pixels (makes for more difficult cropping), and...whatever.

I suppose I could eventually get an R6, since the 7DmkII (my second body) really can't keep up.  But this is a hobby for me.  I did run into a pro at our conference semifinal (shooting for the host; we were the lower-seed team) who uses an R6 as his primary body, and he's very happy with it.  This facility was about 2 stops brighter than our home court.  I got away with ISO 8000 on the 7DmkII and it works quite nicely on the R7; on the R6 it would be very smooth.  I shot ISO 4000 at this facility, and gave 2/3 stop to the aperture, and gave it another 1/3 stop exposure to get more detail in our dark uniforms.