R6 Mark II and Sigma 150-600mm C incompatibility

[Mitch_P]

I am upgrading to an RF 100-500mm L, so it won't be an issue for me moving forward. But I thought I might warn others that some versions of this lens have incompatibilities with the newer R bodies. If you're shooting in Servo, the AF will "pulse" when shooting something near the MFD. FWIW, this issue is also discussed on some YouTube posts. Please don't blame the victim 😉

As far as I can conjecture, Sigma won't address this problem in fear of Canon coming after them, and Canon won't update their firmware to suit some other manufacturers lens. That leaves the user in the lurch.

Another TOTAL incompatibility is the Irix 11mm ultra wide MF lens. This lens will freeze the R6 Mark II until you remove the battery. This body/lens combo does not work AT ALL. I'm guessing it's the same with the entire Irix lineup, but I haven't tried them all.

I think they all worked on the original R6? Pretty sure these lenses are also fine on the original R. AFAIK, it's only the newer R bodies.

If Canon reads these posts, my advice would be to get this sorted out or let Sigma know it's OK to fix it. I've been talking my friend in to upgrading from his T7i, but I have to take back the recommendation because he uses a Sigma 150-600mm C. He can't afford my $2500 fix of upgrading to the RF 100-500mm L. Without some kind of solution, you've lost a sale of a new camera body, which could have led to a lens sale in the future. As it is, I'd recommend a Sony and MC-11 converter to him as a 100% working setup.

[Mitch_P]

I can assure you the problem is NOT related to using a tripod. I am handheld 99.999% of the time, not even sure where my tripod is these days. I experienced the pulsing problem and then found his video while looking for a solution. I assumed I was doing something wrong, but found other people experiencing the same problem. I still haven't found where it was my "user error", can you summarize it for me? It's an older Sigma lens on a newer Canon body. The chances of incompatibilities are significant. Again, I've happily moved on but wanted to warn people about this problematic combination.

[shadowsports]

@Waddizzle,

Well said.  

And @Mitch_P,

My reply was not directed at you, it was just a general reply to the thread outlining what was discovered over the last 6 - 7 months.  

I'm glad you like your RF100-500.  This became one of my favorite lenses right after it's purchase.  Shooting with it is very satisfying, and it's a lens I wouldn't want to be without.