Talys said:
A perfect video-purposed camera will have lower resolution/pixel density, because that's how you get less noise and better low light performance. It should have an electronic viewfinder, because you can't see the display screen in the sun (and monitors with shades are often not appropriate). Factors like drive speed (fps) and autofocus modes don't matter much. Instead, in the consumer-ish market, you're looking for features like dual pixel autofocus, subject tracking, and facial recognition.
A perfect wildlife camera for enthusiast types will have higher resolution, because we're forever too short on reach and are forced to crop. We want optical viewfinders, because they don't have refresh issues, autofocus modes and precision are very important, more fps is always welcome, and things like subject tracking don't matter at all. Plus, we're looking at how big the buffer is and how quick it can empty out, something that video people don't care about, because what they want is the ability to constantly write data at a speed fast enough for whatever resolution they're recording.
As usual, that's well-reasoned. But I don't quite agree.
First, I don't think we are talking perfect anything. Perfect is the realm of Canon Cinema and the 1D line, not the APS-C line. So, in my mind it's all about the compromises.
Since video cameras generally shoot at lower shutter speeds than stills cameras (double the frame rate) and since random noise can be less apparent on video (it moves around from frame to frame) I think a case can be made that a video camera can sustain higher pixel density than a stills camera.
Note that I'm only saying "a case can be made" and I'm sure some video folks will disagree. But, I'm just saying that the 1/60 of a second for video allows for a lot more light to hit those pixels than the 1/800 and above needed for birds and moving wildlife. Plus, with video, you are much less likely to be using a 400mm plus lens, which drives up the shutter speed needed for stills photography.
You may be correct about an EVF, but any video DSLR is a compromise and this is a rumored DSLR, not a rumored mirrorless with an EVF.
On the other hand, a wildlife camera needs to have the highest possible ISO performance because most birds and mammals are active during the lowest-lit parts of the day. Yes, reach is important, but if the image is noisy that will only get worse as you crop. And, as I mentioned above, those high shutter speeds are needed with those long lenses.
I'm not sure what you mean by "things like subject tracking don't matter at all." Subject tracking matters a whole lot if you want to shoot a bird in flight.
So, while I respect your opinion, I'd have to say that from my perspective, I tend to reach the opposite conclusion.