unfocused said: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.
Thanks
So first of all, I'm not a video guy at all. For me, aside from the occasional family thing that I could just as easily take from a smartphone, I don't do video. I totally agree that a flagship APSC DSLR is not an ideal format for a video-centric rig, which I didn't articulate well -- but I what I was driving at is that basically, nobody should be spending $2,000 (or whatever) for an APSC DSLR and hoping for an awesome 4k video rig.
I mean, maybe the 7D3 will do 4k, but I just can't imagine that 4k video is a reason to buy the 7D3, 90D or model in between.
On the birds in flight, I have a miserable track record with AI tracking (using sensitivity/acceleration/point switching on 5D/7D bodies), but it's not really the fault of the tracking technology. Basically, what happens is, if the bird is small enough in the field of view to be effectively tracked and cropped, I will be probably be unhappy with the final result, because the bird will be too small, even if it's perfectly in focus.
If the bird is big enough for me to be happy with the result, I will be tracking the bird anyways. At the end of the day, it's just easier to use spot AF or center + expanding points and make sure I'm pointing at the bird in flight
I am happy to be convinced otherwise; I just haven't been able to get good enough results out of tracking to use it, and it was a large contributing factor to my deciding to buy a 6DII despite not having any of the fancy AF modes.
I totally agree with you with wanting high ISO performance so that we can raise shutter speeds. However, I have been convinced by people in this forum that getting much better than 80D or Sony A6300 (given their pixel densities) is an unrealistic expectation given today's technology. So with APSC, what I'm primarily looking for is a bright daylight camera with lots of reach and shooting at lower ISOs.
At over ISO 800, I am not really happy with my 80D's results for most bird shots, and prefer cropping from a full frame image on my 6DII. The additional noise, especially in the eyes, just kills the shot for me. Not because they're terrible photos -- just, it'll be another at-best mediocre shot, and I generally just cull those because I already have terrabytes full of them.
There are exceptions, of course -- especially if it's something I've never photographed before... I'm just talking about a general rule of thumb for me.
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