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All signs are pointing to the Canon EOS R6 Mark III being announced in the next couple of months. This camera will be a huge release for Canon and will likely sell extremely well, now and into the future.
There have been a few specifications rumors in the past, but they were a long time ago, and none of them are likely accurate beyond a few things that would simply be the natural evolution.
Image Sensor
I don’t mind 24MP at all, but it’s probably best, even if it’s just for marketing purposes to bring the pixel count up to 32MP (34.2MP effective). A lot of us out there are thinking that the EOS R6 Mark III will get the same sensor found in the recently announced Cinema EOS C50. Adding some volume for image sensor production would be a logical way to save some money.
I’d like to see a resolution bump in the EOS R6 Mark III, even if I’m that crazy 24MP guy.
Mechanical Shutter
To blade or not to blade? That is the question.
The day will come when the mechanical shutter becomes a thing of the past. We have moved on from flappy mirrors, and mechanical shutters will likely be next.
I don’t think the time is now for a 6-series camera, and I’d like to see it remain.
We also don’t really know about the performance of the Cinema EOS C50 for still one way or another, and the readout speeds will obviously play a big role in all of this.
For now, I’d like to see the mechanical shutter remain.

Media
I do not like mismatched memory card slots, and that was my least favourite thing about the EOS R3. There are lots of shooters that are not bothered at all about having a CFExpress and SD card slot on their 5 series cameras.
This is going to be a camera I will have some serious interest in, and I would like to see the EOS R6 Mark III remain dual SD card slots, as there is little chance of a dual CFExpress set up.
I have a pile of SD cards kicking around that need a new home.
The Need for Speed
How fast should the EOS R6 Mark III fire off images? As fast as humanly possible! Just because there isn’t a lot of use cases for 40fps, it’s still fun sometimes.
We won’t see anything faster than 40fps, unless it comes with the crazy 195fps feature that the EOS R3 had. That’s a feature that I wouldn’t mind coming to the EOS R1, not that it would get used very often, but I did use it on the R3 for shooting small birds.
I would like to see Canon keep going with their 40fps and I don’t care one way or another how fast the mechanical shutter would be.

Precapture
I think pre-capture is going to become a core specification in the next generation of cameras that are targeted at “prosumers”.
I’d be bummed if it wasn’t a feature of the EOS R6 Mark III.
Canon was late to the party with the modern version of this invaluable technology. Kudos to Olympus, Fuji, Sony and Nikon for pushing it on us.
The implementation in the EOS R7 doesn’t really count in my eyes.
EVF
Please use the EVF found in the EOS R3 and EOS R5 Mark II. I’m not sure how many people use the eye control autofocus, but I’d be fine if that was omitted.
The current EOS R6 Mark II sports a 3.69m-Dot EVF, and a move up to the 5.76m-Dot EVF found on those cameras should be a given.

Rear LCD
I’d like Canon to introduce a new mechanism for the flippy screen. It’d be great if it could go up and down without having to swing out. I don’t mind it the way Canon currently does it, but it would be really nice to see an implementation like the Panasonic S1 II.
The resolution of the rear screen I don’t care about, if lower resolution brings longer battery life with it, I’m all for that. I don’t “chimp” all that much anyway.
The Rest
There is going to be all the AI stuff, with the DIGIC accelerator alongside an updated DIGIC X processor. If it can deliver similar autofocus performance to the EOS R5 Mark II, that would be great, and I expect that it will.
It won’t be as good as the EOS R1, but in a lot of cases, we’re splitting hairs in performance comparisons.
Ergonomically, I have no real issues with the EOS R6 Mark II. I wish it had a top-down LCD screen, but that’s not a dealbreaker and isn’t going to happen.
A lot of people would probably like to see a video/photo switch somewhere on the back of the camera. I’m indifferent in that regard.
If Canon could improve the weather sealing for the 6-series, I’d be very happy about that. When you have a camera like the R3/R1 and are using an R62 in inclement conditions, it’d be nice to have a bit more consistent confidence in what the camera can take.
Video
I am not a videographer in any way, shape or form. I cannot comment on what I’d like to see when I don’t use video features in any serious way.
What do you hope to see?
Chime in on the forum with features that you’d like to see. Try to keep it somewhat realistic, but there’s nothing wrong with a creative idea we haven’t thought of.
We’ll have more to say about the EOS R6 Mark III later in the week or early next week.

These features can make R6MK3 (also R7MK2) a good body. I hope it will be true.
As a very pleased R6mk2 owner those should be noticeably better to make me change.
If more MP please also better MP (readout, high ISO, s/n, DR)
If no more mech schutter please at least a mech sensor protection in "off".
If eye AF, then let it work well with glasses 8).
About EVF and display resolution: longer battery life is more important to me than that.
Please stay at dual SD slots. Those are fast enough for normal bursts, IMO.
I would be surprised if they add precapture to R6 or it will be significantly worse than R5 MK2 one maybe like 0.2 s.
As long as they are both generalist cameras they need differentiation, if they were more specialised like on more video oriented or action oriented they could provide the more quality of life features to all the bodies.
If you want both the top LCD and new tilt screen you will have to wait for the R5 MK3.
Personally I would be satisfied with 32mp + new tilt screen + R5 MK2 EVF even though I would like to have the top LCD too.
But...
IMO this is a shooting style that is referring to Pros (and I don't think they do such long bursts, because of too much time for selecting in post).
But if this your style, go and get the Pro tool (R3 or R1, or Sony A9 II or A1 II, and pay for that) and not the ProAm R6 series.
See the manual: https://cam.start.canon/en/C012/manual/html/UG-04_Shooting-1_0330.html
The R6 Mk II can also pre-record video.
The R6 Mk III will likely have the same method for pre-continuous shooting as the R5 Mk II and R1, i.e. store the captured images as individual files.
I have 2x R5 an R6 ll and a R3 and one thing that is clear is that when I am rushed to download, the CFexpress is blistering fast to download compared to even the top SD card.
I use the 128g Sandisk because of the claimed faster speeds than the 64gb Sandisk. I do not really need 128g, I want the download speed.I also have one Hoodman, good card too.
That said, If I am not at all rushed, I only pull the SD card.
The implementation in the R7 and R62 isn't remotely close to the same thing that we see in the R52 or R1 or from the other manufacturers. It's more a software trick using DPP than the camera actually working to write and clear the buffer in real time.
In other words, it's terrible.
The R52 at 45mp can write 30fps to UHS-II cards in 80+ shot bursts. That will probably be the required memory card type if they choose to go dual SD. The CFe max burst isn't that much more.
I'm also a big proponent of just rolling with CRAW, that will pretty much double your maximum burst rate.
That's a cool line of cameras.