Re: FF Mirrorless, what's it going to take Sony, Canon, Nikon
Arka wrote: Holger wrote: AcuteShadows wrote: technic wrote: AcuteShadows wrote:
The aim would be to have a camera that can do AF based on the actual image (say, eye-detection) while retaining fast AF that mirrorless don't achieve at present. In addition, the image sensor would not need to have any AF circuitry, so that it can be optimized for image quality.
Why do you think such a DSLR would have faster AF than a mirrorless camera with the same eye detection / tracking etc.? It does't make sense to me, even ignoring the basic limitations of the mirror box and higher cost factor.
DSLR now has faster AF than mirrorless. I assume this primarily due to the fact that a mirrorless camera must limit the area dedicated to AF on the sensor in order not to degrade image quality. If you have AF away from the image sensor, you can use the entire area for AF. Or, alternatively, you can use some of the area for image analysis, and the remaining part for phase AF. As you don't need perfect image quality for image analysis, the area dedicated to AF can be larger in this case.
"DSLR now has faster AF than mirrorless." That statement in itself is very misleading and too general to be valid. AFC, AFS? Initial AF acquisition? Tracking? Wide open or stopped down? Good light or bad light?
My experience is in many cases and situation the opposite of what you claim. I used high end DSLRs too, for quite some time in parallel professionally, so know the differences quite well. In addition, the fastest AF is not helpful if AF accuracy is lacking.
It isn't misleading - it's incorrect,
I've used Nikon's D3, D5, and own.a D850. I also own the A9. It's AF is better in every mode, period. Faster AF-S, faster AF-C, more accurate in every mode and in the comparable light, and it adds 93% viewfinder coverage, equivalent performance in live view versus EVF, and eyeAF in still and video modes.
In my testing (before firmware update), D5 and A9 were _on average_ similar. Now the newest firmware should have propelled the A9 further. But I don't shoot the most demanding sport or BIF, so wanted to be a bit more cautious in my judgement. Thanks.
May 07, 2019 at 01:49 AM
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