Does anyone get lens pulsing using the EF to RF converter?

[Crystalcooksnap]

Hi there, I own a Sigma 150-600mm Sports lens that I use through a Ef to Rf converter on my R6 and R5 mark ii. I have noticed it does a bit of pulsing as if it's having issue focusing. It is not all the time but it does occasionally happen and I have missed some shots due to it. Has anyone else had any similar issues? Maybe the converter? Maybe the lens? 

Thanks in advance! 

[shadowsports]

Greetings,

I have heard of this behavior occurring with the sigma 150-600c and various mirrorless body's.  I think it was first reported on the R7.  Are you using the Canon brand lens adapter?.  If not, please consider switching.

Things that might help.  If you're shooting with a tripod, turn off IS.  Your MFD changes depending on your FL. If you are trying to focus on an object that is too close for the zoomed FL you are using, the lens might pulse. 

The other thing you should check for is the firmware version on your lens.  Grabbing the sigma USB dock will allow you to update its firmware if it's far behind.  

If you are not using a Canon brand lens adapter, I suggest you switch, as it offers the best overall compatibility.  

I'm sure others will also have comments.

[March411]

Crystalcooksnap, I have several Sigma lenses including the larger Sigma EF60-600mm that are often daily drivers on my R5 and R6 MkII. 

When I made the move to MILC several of the Sigma lenses were giving me challenges, racking and chasing focus. I found some of the challenges were due to shooting in low light. Even the slower Canon lenses I own will have challenges in low light. For perspective I have the same challenge with my RF100-400mm F5.6-8 IS USM because it just can't grab enough light and occasionally with my RF24-240mm F4-6.3 IS USM for the same reason. 

The other challenge was using a third party adapter which I assume was simply a communications error as the third party resellers were not making the 12 pin to 8 pin communication clearly. The simple EF - RF adapter cleaned up some but not all of the challenges, there was definite improvement. 

The most significant improvement came after talking to both Canon and Sigma, both recommended a firmware update for my Sigma lenses. You can do this yourself if you pick up a Sigma dock (fairly cheap), local service centers can complete the update or some camera stores can also assist. Once I updated the firmware on all my lenses the challenges all but disappeared except in low light.

I can say that the Sigma lenses perform at the same level, which is very good as Canon lenses at the same speed.

[kvbarkley]

I have heard that it is due to the slow AF speed on the R7. You might try shooting with mechanical shutter. That slows it down enough for the focus to work.

[ebiggs1]

" If you're shooting with a tripod, turn off IS."

I hear this all the time and I have done extensive testing and can not see any difference and no benefit. I never turn it off as a matter f fact I don't even think about it. And if the SS is very fast to even just fast, IS has no effect at all tripod or not.

" Grabbing the sigma USB dock will allow you to update its firmware if it's far behind."

Not only a great suggestion but essential because as you can alter other settings on the lens which may help.

[Waddizzle]

“ I hear this all the time and I have done extensive testing and can not see any difference and no benefit. I never turn it off as a matter f fact I don't even think about it. And if the SS is very fast to even just fast, IS has no effect at all tripod or not. “

You say this all the time, too.  You’re using 1D Series DSLRs. They are capable of automatically disabling the IS with select lenses. 

Besides, you seem to mostly use One Shot AF.  The pulsing only occurs in Servo modes. 

[ebiggs1]

"You’re using 1D Series DSLRs."

Yes sir, I do 'today' but in the past I have had 6 Rebels and several different brand of DSLRs. I still stand by, turning IS off when using a tripod makes no difference. No camera/lens I currently use has the ability to sense whether it is on an tripod or not. If someone is seeing problems and is reporting them as IS issues it may be that the IS on that lens is faulty. I had a SIgma lens, in fact two Sigma lenses, that the IS, or OS as SIgam calls it was the factor in OOF shots but it happened on or off the tripod.

The way IS works is greatly misunderstood by a  lot of folks. The one take away is as SS gets faster IS works less and less again tripod or not. However if you think IS is the cause of all your focus issues turn it off. That's why Canon put that switch on there.