The RF mount mirrorless version of the EOS-1D X Mark III is coming in 2021 [CR3]


Oct 18, 2011
Every 1DX was TOL in terms of video as well as stills over the 5D series (except in the first one there was a separate 1DC model)

And this won't change here either, when you ask 7000$+ for a camera in 2021 (a newer generation sensor suggests a price increase over the 1DX III), it needs to deliver on all fronts.
Also, the processing speed and heat sink capacity needed to allow for the crazy frame rates and buffers in 1D stills cameras make massive video specs pretty easy.

100% will have 8k, and Id bet 4k120 is likely as well. Definitely gonna have RAW, etc as well.


Canon Shooter
Nov 15, 2011
I wondered, after the R5 overheating issues, if the R1 was not in the works yet because of thermal issues. I think these typically get a dual Digic set up, and if one of those bad boys is throwing lots of heat imagine 2.... That's not to say they wouldn't just do a single next gen Digic, but it was just my thought that the processing required for an R1 series could be a limiting issue at the moment.

The larger body with built in grip could give them some opportunities though for heat dissipation ideas.

And no, I'm not trying to sound the alarm that this thing is going to melt down or what not.

I'm just really excited to see what this can do. I imagine its hard to top the R5, but perhaps they have something up their sleeve. Top of the line EVF, faster mechanical shutter, smarter focus tracking AI....who knows. I imagine they'll forego any 8k video. Maybe land this on a 24MP sensor to differentiate from the R6, but still not go overboard for what most users need. Maybe instead of memory cards it will have a slot for one of those m type SSDs (crazy idea I know).

I'll never own one, but I'm still excited to see what it can do.

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CR Pro
Jan 28, 2012
The problem with the EOS R1 is that the camera body will be so good, that it wouldn't feel right to use old EF "L" lenses even though the EF-RF adapters work just fine. Thus one could end up with a fantastic EOS R1 camera body with a whole new set of RF "L" lenses. When the RF "L" lenses are added to the equation, that pro-R camera system really becomes an investment.

That's why I chose to get the EOS-1D X Mark III camera body without the need to purchase RF lenses and reuse my old native EF "L" lenses.

I’m going to have to just deal with my EF L glass for now. I’ll be in the poor house after I get one of these...
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Sep 1, 2016
I think it's clear between 8K in DSLR cameras and this week's pro cinema RF mount release that the new RF glass is designed for much higher resolution sensors. Not sure if that makes EF worth less or more. Look at Canon's K35's right now, they're hot to trot with film makers for the added softness they bring.

I'm excited by this body. Past dual CF express cards, which seems a given if in second half of next year, I genuinely can't call what more you might need on top of the R5. 45MPx at 20FPS is crazy already. What's next?

H. Jones

Aug 1, 2014
Also, the processing speed and heat sink capacity needed to allow for the crazy frame rates and buffers in 1D stills cameras make massive video specs pretty easy.

100% will have 8k, and Id bet 4k120 is likely as well. Definitely gonna have RAW, etc as well.

Considering the 1DX Mark III didn't provide *any* resolution update to the 1DX Mark II's 20mp resolution, I'm not sure I'd expect it to manage the 45 megapixels needed for 8K. Canon isn't going to pull a total 360 on a camera they decided was fine with no increase to megapixels. They did their research, and their research said news work didn't need a big resolution increase. My newspaper downsizes every image we file to 2 megapixels, and most newspapers deal with the struggles of filing in the field where you have spotty cellphone service and can barely send a 2 megapixel jpeg at times.

I think high quality downsampled 6K is more likely. The top cap I'd put on the R1 resolution is around 32 megapixels, which I think is a sweet spot right now. I personally could do about 80% of my job with 30 megapixels and be happy, I love the 5D Mark IV we use at my full time job and wouldn't mind that resolution for a 1D.

I also have the R5 already, and the 45 megapixels at 20 FPS has turned into a lot of processing time on a top-of-the-line laptop and about 256 gigabytes just to cover one house fire. It's definitely changed my workflow from what I'm used to with the 1DX Mark II. I love the additional reach and ability to crop in when I really need it, but the majority of my images never get cropped and then end up downsized to 2 megapixels anyway.

I'd rather see a dynamic duo between the R5 and R1, like the 5D mark III and 1DX, where you have a 5D with more resolution in a slightly slower body, and a camera dedicated to absolute speed in all forms with a somewhat lower resolution.
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I'm New Here
Aug 13, 2020
2021 will be a flagship showdown.

Let me initiate a drooling sequence:
  • 30 mp stacked w/o rolling shutter
  • 14 fps mech. shutter in 14 bit / 20 fps el. shutter in 12 bit (13?)
  • LP-E19H 3200 mAh
  • 2x CFexpress B and 2x SD UHS III
  • AF sensitivity -8EV (minimum :))
  • No IBIS (Please God!)
  • No video and low-pass filter (Please God!)
  • 1 000 000 shutter actuations guaranteed
What else?
Strange specs given the R5 and 1DXIII marks already set to compare. I would say definitely video, 2 slots (CFe and SD), IBIS probably, low pass filter.

H. Jones

Aug 1, 2014
Another thing I'd throw into this, I won't be surprised if it hits at least 24 or 30 FPS raw bursts in stills, if not higher, especially if the resolution doesn't change much. 20 FPS is a spec that the R5 and 1DX3 already both pull off.
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Jan 22, 2012
For me to consider it, it would need to be around 32 mgpx or more. Am really curious to see how it will better R5!
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Jan 26, 2017
I think the most curious thing about this rumour is the suggestion that it will not have the 1DXIII's sensor. I mean, the 1DXIII's sensor will be less than 2 years old at the launch of this hypothetical camera, can already support very high resolution video output, has limited rolling shutter (I think), and compares well to any other sensor on the market.

Using a new sensor this soon seems uncharacteristic of Canon's past decisions, so I'm wondering if this sensor is going to really drive into some new technology opportunity - maybe improved low light AF sensitivity, or a global shutter. Off chance of resolution increase (?), but I doubt it.

I just can't help but wonder about what technological advance justified not using a very capable sensor already available, when they have done that in the past. Or who knows, maybe they'll throw the formula out the window and put in the R5 sensor - it certainly seems to be able to keep up with speed despite the resolution bump.


CR Pro
May 14, 2020
I think 8K video will be a driving force of the future. The R5 is just the beginning.


Jul 30, 2010
Here lies DSLR
No quite. there is always a delay between the EVF and the lens. While optical view finder in the DSLR will have zero delsy. Therfore for action shot and BFI, DSLR is still the first choice before the mirrorless. One exception, Lieca M10 and similar. They still have a true opticel view finder.
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Unsolicited & Always Free
Dec 17, 2013
imho I do not think you should expect a 1 series body to deliver on all fronts for video, yes it will be a hybrid and it will be amazing but it will not deliver on the level of a Cinema body. That is not why it costs what it will cost.


CR Pro
May 14, 2020
There are many features and options that can differentiate a Hybrid from a Cinema camera—with a commonality of 8K video.
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