Error 70 often caused by Canon RF to EF Adapter

[Insight32]

Ever since owning the EOS R5 I have had consistent error 70 freeze-ups while shooting timelapses.  I didn't own any RF lenses, but was using Canon and other 3rd party brand lenses with Canon's RF to EF adapter ($99).    Regardless of which lens I shot with (Canon EF 50mm F/1.4, Sigma 20mm F/1.8, Rokinon 14mm AF F/2.8, Sigma 150-600mm) the camera would eventually give me the ERR 70 message at some point during my timelapses.  Sometimes it happened after 160 frames, sometimes after 230, but almost always before I got reach 300 frames.    I was able to figure out that it ONLY happens when my lens was stopped down to any aperture other than wide open.  If I shot at the widest aperture I would never get the error.

Canon twice replaced the Main PCB assembly, but each time the error still occurred.  So after getting nowhere with their support department I decided to prove my theory.

I went out and purchased a Canon RF 24-105mm F/4-7.1 lens and also the RF version of the Rokinon 14mm F/2.8 AF lens.   When shooting with either of these native RF lenses I have yet to get the ERR 70 even with 1000+ frame timelapses.    Yet, when I go back to their adapter and connect one of my "EF-Mount" lenses I get the error.

After all the testing I have done with different memory cards, different Canon batteries, and different lenses. I can now say with 100% confidence that the EF adapter is causing many of the ERR 70 issues.  

I will be letting Canon know, but I have no idea how they plan to correct it - if they plan to at all.

Ron

[Insight32]

I purchased another adapter (same model) and got the same results.   

[Tronhard]

Thanks for that info - it provides another piece in the puzzle: and it is indeed a puzzle!

The only thing that immediately comes to mind is a full reset. And check firmware for the lens and camera. Which I am sure you have done: you apoear to be very thorough.

[Insight32]

A real issue that Canon doesn’t seem to be too worried about.   

[Tronhard]

I agree there seems to be little movement on this, but I have never heard of this ever before, and can only speculate that it may be not one thing but a combination of things that are causing this.  I'm sure you have long-since done all the easy stuff, like changing cards, different batteries etc.  I must admit I am stumped - I sincerely wish I could help.

I do have a thought... hmmm... I wonder if there is an issue with the saving path.  Could it be an issue with the buffer or the card writing elements?   So, as this is an easy place to start, I am wondering what your card configuration is set up as - i.e. what card or cards are you saving your time lapse files to: both cards, the CF Express only  etc.?

[Insight32]

I’ve already mentioned this to Canon, because to me it seems like a buffer issue, yet the didn’t seem to listen and just replaced the main PCB assembly for the second time is as many weeks.     Ive duplicated the error with various brand and types of cards, duplicated it with cards that were freshly formatted in the camera, fully charged battery vs partially discharged battery, etc.   The only variable I haven’t been able to test is with a second R5 - that would help me rule out buffer or writing issues with my current R5

[Tronhard]

As an addendum to my last post, I just stumbled upon a post you wrote in February entitled: "Dear Canon - The EOS R5 “ERR 70” has nothing to do with memory cards"  so please have patience while I read this - there is a lot to digest in this interchange!

[Insight32]

This is the video that I shared with Canon support - who by the way never bothered to watch it.    https://vimeo.com/597322614

[Tronhard]

In response to: This is the video that I shared with Canon support - who by the way never bothered to watch it.  

That is indeed frustrating and disappointing.

[Tronhard]

Well, I have now read your post of February and it only adds to the mystery...  I can now see you have flogged the card issue to death very effectively and in a scientific way.  Two things really come to mind:
1/   You have certainly applied good process to try to isolate the issue, and at no small expense!   I appreciate the effort and expense you went to in order to make sure it happened with a Canon lens, because then Canon should take responsibility for that! At the very least it is important that Canon recognize the issue as existing and indicate if and when they can address it.  I can see how frustrating it is not to have either and you have my sympathies.
2/    A startling lack of response from canon to that February thread, which is disappointing...

If it is not a mechanical issue, then it is likely to be something in the firmware algorithms and that is way outside the purview of this space.  I'm sorry that I cannot help you more, but this is outside of my scope.   I hope that this is resolved for you and will eventually lead to a firmware upgrade for the issue.ds

[Ouks]

Hello all

i'h having the same issue using my Canon R6 with a canon adapter and a Sigma 150-600 contemporary lens. I do wildlife photography and i use Burst mode H+. Recently I've had a block screen and my buffer was freezing( loosing all pictures after that). After that inhad Err 70 popping up and also lost all pictures in the buffer

its frustrating because this is an expensive camera. I wont be able to trust it anymore