02-27-2023 04:01 PM
Hello,
Does anybody have an issue with autofocusing in 400mm with this lens? When I extend the lens to 400mm and try to focus, the lens is not focusing. I have to retract the lens to 100mm and refocus. Only then autofocus works. It happens almost every time in any mode(M,Av,Tv or Fv). Camera Canon R6.
Solved! Go to Solution.
02-27-2023 07:19 PM - edited 02-27-2023 07:49 PM
I just reset the camera setting and the default is "on" for this setting.
from the canon r6 manual below instructions need to be expended:
02-27-2023 04:26 PM
I don't own this lens, but just a couple questions to help troubleshoot:
02-27-2023 04:37 PM - edited 02-27-2023 04:38 PM
This is my second RF100-400 IS USM lens. Both behave the same, whether IS is ON or OFF. The autofocus is not working when I extend the lens to 400mm and it's out of focus no matter which button I use(back buttons or main release button). I tried to gradually zoom out while holding AF button and sometimes it start focusing at around 135mm. But most of the time I have to retract the lens to 100mm in order for lens to start autofocusing.
02-27-2023 04:48 PM
If you have other RF Mount lenses do they work correctly on this camera.
-Demetrius
Current Gear: EOS 5D Mark IV, EF 16-35mm F/2.8L III USM, EF 24-70mm F/2.8L II USM, EF 50 F/1.8 STM, EF 85mm F/1.8 USM, EF 70-200mm F/2.8L IS III USM, 470EX-AI & 600EX II-RT
Retired Gear: EOS 40D & Sigma 17-50mm F/2.8 EX DC OS HSM
02-27-2023 04:57 PM
Update: The "problem" is solved. In the menu; AF; #4; "Lens drive when AF impossible" was OFF. When I changed it to ON, AF is working without any problem.
02-27-2023 06:24 PM
You shouldn't have to enable that setting to force the lens to focus.
This is sounding like you have an issue with the camera. I would first reset all settings and try things out again. If the issue remains, you probably should look at sending it in for a repair.
02-27-2023 07:03 PM
Thanks, You may be right. My other RF24-105 L f/4 lens is not doing this. But it's not 100-400mm zoom. I'm going to call Canon tech support tomorrow about this, will see what they say.
02-28-2023 04:21 PM - edited 02-28-2023 04:23 PM
I called Canon tech support today regarding my issue. Their response was: Your lens and camera work within the normal operation. And they suggest using "Lens drive when AF impossible" and "Continue focus search: ON.
02-28-2023 06:17 PM
@rs-eos wrote:You shouldn't have to enable that setting to force the lens to focus.
This is sounding like you have an issue with the camera. I would first reset all settings and try things out again. If the issue remains, you probably should look at sending it in for a repair.
That is exactly what the problem is. Long telephoto lens can get grossly out of focus so the camera can't "see" anything to start focusing on. I had the exact same problem with my 1D X MkIII. I had utilized some recommended settings from an online user. Lens wouldn't focus when I was trying to focus on ospreys flying. If I manually focused to get the birds close then it focused OK.
If I switched out of the custom settings back to my basic it worked fine. Took a while to sort out the problem.
02-28-2023 06:31 PM
Thank you for this added explanation, John! I had assumed incorrectly about the default value of that setting as well.
09/26/2024: New firmware updates are available.
EOS R5 Mark II - Version 1.0.1
EOS R6 Mark II - Version 1.5.0
07/01/2024: New firmware updates are available.
04/16/2024: New firmware updates are available.
RF100-300mm F2.8 L IS USM - Version 1.0.6
RF400mm F2.8 L IS USM - Version 1.0.6
RF600mm F4 L IS USM - Version 1.0.6
RF800mm F5.6 L IS USM - Version 1.0.4
RF1200mm F8 L IS USM - Version 1.0.4
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