Indpho wrote in post #19155039
Currently have R6 , looking to add R5 sometime next year.
Just one question. Does the R5 need both cards inserted to operate or
will it work with just the SD card inserted ?
DUAL CARD SLOTS
The EOS R5 does not require you to use both card slots at the same time. Much like the 5D Mk4 and other Canon bodies with dual card slots you can set them up using the following options:
- STANDARD - only records to one card (I'll explain the hell out of which card that is by the time you get to the end of this long post)
- AUTO SWITCH CARD - works like an 'overflow' when the first card gets full it begins writing to the second card.
- REC. SEPARATELY - allows you to record raw to one and JPEG(or HEIF) to another
- REC. TO MULTIPLE - records the same thing to both cards (except for video which is annoying and another item on my ever-growing CANON WISH LIST for features - this is the mode I've been using since the 5D Mk3 and it has some interesting limitations which I will expand upon in great detail below...
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© Jared5 [SHARE LINK] THIS IS A LOW QUALITY PREVIEW. Please log in to see the good quality stuff. There are some interesting bugs, I mean '
features' with the
REC. TO MULTIPLE option on Canon bodies and I really can't wait for these to get fixed.
Why does this matter to me?When I'm shooting portraits and unable to tether to a laptop I'll show the clients their pictures on the back of the camera's screen. When they see one they like I'll use the
RATE button and it shows up with one star in Lightroom so I can quickly find it when I'm ready to edit the image.
Now I gotta go off on a tangent about the lack of the
RATE button on the EOS R:
Going off on a tangent for a minute - Portrait issues with the EOS R -
Sorry about the click-bait, this has nothing to do with the quality of the images from the EOS R but merely the experience when shooting client portraits based on the way I used the camera (coming from the 5D Mk4).
When I would shoot portraits with the EOS R I was bummed that it didn't have a RATE button so I programmed the arrows of the touch-bar that everyone hates to work as the RATE button. Yes it 'worked' but very sluggishly and no matter how positive I was that I pressed the touchbar to RATE the image it acted like it wasn't sure I really wanted to RATE the image. There was a delay, like asking your kid to take the garbage out and he doesn't seem to understand that you mean "DO IT NOW!" I had to be very deliberate on how I pressed the touchbar in order to be sure the RATE actually took, but even when I did so I had to wait for it to happen before scrolling to the next picture. ...which brings me to my next issue of shooting portraits on the EOS R, the touchscreen.
I remember when I got the 5D Mk4 and would show clients their images on the back of the camera's screen; I'd hold the camera by the lens, show them the screen and demonstrate how they could just 'slide up' (because I'm shooting in portrait orientation) to go back in time through the images. So many of them said "wow, that's so cool that your camera can do that" and I always thought the touchscreen feature of the 5D Mk4 was a gimmick. I quickly got used to the touchscreen of the 5D Mk4 and it was great for my own use and easy for the clients to swipe through and review images.
Not the same with the EOS R, not even close.
Yes the EOS R has a touchscreen and yes you can swipe through and move from image to image, but it was so unresponsive, laggy, and sluggish compared to the 5D Mk4 it was literally embarrassing. I'm not exaggerating, I was embarrassed when I would watch them swipe up/down to go through images and it was hanging up like it wasn't sure if they really wanted to swipe or not.
I'm so glad this has been improved on the EOS R5, the RATE button has returned (and if you never plan to use it you can program it for something else) and the screen is much more responsive when swiping through images.
I need to do a side-by-side comparison with the 5D Mk4 and EOS R5 to see if the touchscreen responsiveness of the EOS R5 is identical to the 5D Mk4 because my brain tells me the EOS R5 is barely slower than the 5D Mk4 but still a dramatic improvement over the sluggish responsiveness of the EOS R.
OK, sorry about that tangent, back to the dual card slots (which the EOS R does not have).
The RATE button not writing to both cards in REC. TO MULTIPLE has been an issue for me ever since the 5D Mk3 and another item on my ever-growing CANON WISH LIST for features has been to have the RATE button apply to both card slots because IT DOES NOT.
Here's what happens with dual card slots the way Canon bodies work right now:
I have my bodies set to shoot raw+JPEG(medium) to both cards for redundancy. You would expect both cards to be treated identically but they are not, in fact there is a priority card setting which is easily overlooked. I found this out the hard way when shooting video because Canon only shoots video to ONE CARD. When I was using the 5D Mk3 and shot video I went to transfer files from the CF card (my card of choice at the time) to my computer and there was no video on the card! I was freaking out and afraid I was going to lose this client because I couldn't just go back and reshoot everything. This was my crash-course in learning about the priority card setting, which was obviously never a thing with the single-card-slot 5D MK2. I found my video files on the SD card instead of the CF card and was able to complete the job. This got me digging into the user manual and I learned how to set the priority card setting so this wouldn't happen again. ...or would it?
It happened again, and I finally figured it out. I would set the CF card to be the priority card record video, get home and pop out the CF card and the video was on the CF card just as I expected. So proud of myself until I encountered this next problem. When I popped the CF card out of the 5D Mk3/4 and closed the memory card door on the camera the SD card was still in its slot as always. Well almost always, because the only time I'd remove the SD card was when I had to shoot bursts, because Canon put a really cheap SD writer in the 5D Mk3 (here's more info on that ugly story: https://petapixel.com …-if-you-care-about-speed/
).
By removing the CF card and closing the memory card door with the SD card still in the slot the 5D Mk3 and 5D MK4 would assign the only remaining card (the SD card in this case) as the new priority card. This meant that every time I pulled the CF card out and closed the memory card door with an SD card in the slot my priority card would change to the SD card.
And just so mirrorless users didn't feel left out, the same bug (I mean 'feature') still exists on the EOS R5 with the CFexpress and SD cards. I'd imagine the same is true for the R6 because it's more of a "SLOT 1 vs SLOT 2" thing, not really anything to do with the form factor of the memory cards.
Here's how to get around that:

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remove your battery first and then pop the card out of the camera and you're good to go and it won't change the
priority card on you. I usually do this when I get home, I'll pull the battery first because it needs to be charged anyway and then pull the card.
A more risky workaround is to pull the memory card out and leave the
memory card door open.
I don't recommend this at all because if your
memory card door gets broken off or damaged you can't shoot with that body anymore. At least a broken/missing battery door has an easier workaround, but not the
memory card door. Just don't take the risk.
The final option is to remember to check the
priority card setting each time you shoot (if you've removed a card).
For video there's a new menu feature on the EOS R5 where you can set your
priority card default and it will stay that way as long as the chosen card is in the body when you start recording video, so you can't mess it up. I've been using that for video and really wish the same was possible for stills because if you use the
RATE button your ratings will only go to the
priority card not to both cards. This is ridiculous to me because I
can't think of a reason not to RATE redundantly to both cards if you're also recording images redundantly to both cards.
But, and that's not all...
Now the the EOS R5 and R6 finally have the ability (like the 1D series) to record a
VOICE MEMO with the images I figured this would be another potential problem with the
priority card and Canon did not disappoint!
If you record a
VOICE MEMO be sure to remember it will only record on the
priority card. If you transfer files to your computer and it's not from your
priority card you will not have your
VOICE MEMO. Thanks for keeping these limitations consistent I guess.
Sorry about the long post but this simple stuff bugs me because it would be easy to fix (like the problems that never got fixed with the 7D Mk2
but I'm not emotionally equipped to talk about that today 
).