Firmware 1.0.1 Brand New R5 Mark II Freezing/Error 70

[LostOne]

Hello, I have recently purchased a Canon R5 Mark II and have also just purchased a RF 28-70mm f/2L Lens to pair with it. Before purchasing the newer lens, I had used older EF lenses with the E/RF mount adapter and had no issues recording video or taking photos at all in any shooting mode. 

However, upon testing and mounting the 28-70 f/2L lens, I noticed that it added alot of weight, maybe too much to the point where it started presenting several issues with the R5 Mark II. The first began with it not being able to fully turn off while backlit LCD would remain except no sensor cleaning menu would show up prior to turning, just a black screen for several minutes until manually ejecting the battery.

The second time was when it started to present issues with trying to adjust the lens aperture however it was not staying at F2 but rather going to F00 for seconds (no idea what but it prevented me from taking pictures). Thirdly and most repeatedly, the camera began freezing all screens except the viewfinder which wouldn't switch at times and would freeze the top and main LCD panel with the previous still/focus box, on top of this it would randomly spit out a Error 70 code: "An Error prevented shooting. Turn the camera off and on again or re-install the battery". This was the only way of ever getting the camera to reset or fully turn off all frozen LCDs, was forcefully ejecting battery to shut down the camera. Some people on other threads have thought that replacing the motherboards or sending the camera in would fix it however others would say that theyre on their 3rd replacement motherboard and it is still giving the issue. So we now know the camera RF I & II are extremely sensitive/prone to any miscommunications outside of the motherboard. Several RF I owners report the frequency of the Err 70 message only to have it resolved with a future firmware update.

Fortunately, I have tested several times to see if battery, memory card, resetting the menus, or even changing the lenses would at least resolve the issue. I have previously read on another thread that another user was having issues with the Error 70 code appearing and freezing due to the EF/RF adapter on their R5 II and a zoom EF lens (unsure of length) however in my case it appears the lens adapter is not the issue either but rather the contact point from the RF lens to the R5 body.

I am unsure if a firmware update can fix this issue, however I do not want to send the camera in as it is only 4 days since receiving the body and 2 days since the new F2 lens that is causing issues and I cannot firmware update it as it is still on the 1.0.4 update since 2018 I believe.

[LostOne · Accepted solution]

So I think I have completely resolved the problem for me. Today I decided to clean with a lens cleaning cloth both the electrical contacts on the f/2 lens and the EOS R5 Mark II mount and it never froze when shooting video for minutes nor taking photos for an hour. Much better improvement than before when it was constantly giving errors and freezing.

It seems the camera's contacts are much more sensitive to dust on the lens contacts area and vice versa and they must be completely clean in order to not freeze or give electrical errors to the camera. It appears in my case the contacts in the lens had micro particles preventing it from contacting with the camera mount's contacts as my EF lens adapter was also working fine with no issues.

I hope this thread helps anyone who is having similar issues and is on the fence about returning or servicing their camera.

[Waddizzle]

Cleaning may have been of some benefit. It rarely makes a difference, though.

You seemed to suggest that the issue occurs only with the one lens, which has considerable weight to it, but not other lighter lenses.  

The RF 28-70mm f/2 needs to be supported and not allowed to “hang” from the camera. 

[LostOne]

Interesting, do you also recommend hand-supporting the lens at the bottom near the RF mount opposed to leaving it mounted to a tripod and if so, would this also apply to the EF/RF adapter + extended/or prime lenses as well due to the leverage factor of the weight against the RF mount? 
I have read the manual for the lens before and did not notice it, but when operating the camera with the lens it does become apparent that a lot of the force/weight is being applied to the RF mount and it definitely requires a second hand to keep level. Thanks for the input, I’ll definitely keep it in mind next time I take the lens out.

[Waddizzle]

“ Interesting, do you also recommend hand-supporting the lens at the bottom near the RF mount opposed to leaving it mounted to a tripod and if so, would this also apply to the EF/RF adapter + extended/or prime lenses as well due to the leverage factor of the weight against the RF mount? “

The lens mount on the camera should be adequate to support the whole weight of the camera.  Do not assume vice versa.  It should be fine sitting on a tripod when supported by the lens foot. 

You should assume that any lens with a tripod foot needs to be supported, and [not] allowed to dangle from the camera body.  That’s the point of a tripod foot, which can be used as a “handle” to support or carry the setup.  

The exception to this rule of thumb could be a macro lens.  But that’s a different story altogether. 

[LostOne]

Understandable-

Lastly, do you happen to know if Canon sells any tripod/lens foot compatible with the F/2 lens or are they supposed to be sourced from a third party manufacturer? Is it one with the ring that goes around the lens?

[Waddizzle]

If the lens didn’t include a lens foot in the box, then there isn’t one available from Canon.  I