I really want to see a 5dsr 2 come out, hopefully mirrorless. I do like high resolution bodies, and with the new RF lenses this should be a great combo. I really hope though that they can pull this off with DR at least as good as the 5D4. I was hoping for something around 50 mp, basically a mirrorless 5dsr. And although storage is cheaper than ever, 75 mp files would be just crazy large. So maybe just making a really, really good 50 mp sensor in a more 5d-like R body would not be such a bad idea. I think that’s what a lot of us 5dsr owners would go for. Or maybe just me.
The trade offs that people imagine exist for high resolution sensors do not actually exist, at least not at this point in 35mm sized sensors. Using the same technology a Canon 50mp sensor is not going to have any advantage over a 75mp sensor except file size.
Low ISO DR is driven primarily by ADC architecture and not pixel size as evidenced by the fact that Sony/Nikon 42/45mp 35mm sensors have the highest tested DR. Not lower resolution 35mm sensors, or even MF sensors with much larger pixels. For that matter the 5Dsr had the highest DR of any Canon DSLR until they released bodies with on-chip ADCs.
Total image noise at high ISO is also unaffected by pixel size. Higher resolution files look worse when you pixel peep. They look better viewed at the same print size.
Depending on sensor readout speed, and the method used to scale down to 4k or 1080p, a higher resolution sensor could be at a disadvantage for video. But not for stills.
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