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ricaf wrote:
Hello,
Z6II has 273 focus points, Z7II has 493. I understand that it means that in a Z7II you can move your single focus point across 493 points and 273 for Z6II. Probably not a major difference but I am not sure what does that mean in reality when you use eye detection.
Does that mean that the Z7II will be a little more accurate when he detect the eye as the camera activates the focus point the closer to the eye ? Does that makes a difference in portrait photography ?
The point of diminishing return for number of focus points is, IMHO, fairly low. It's rare that you will be trying to focus on something much smaller than a single AF point in a modern camera, so once the sensor has 300, 400, or even 1000+ AF points, it doesn't really matter as the AF points are already going to be very granular relative to most targets. Also, if the subject is so far away such that an eyeball or whatever is a lot smaller than a single AF point (i.e. a distant BIF), chances are DOF will be high enough to have the entire subject in focus anyway, so whether or not the AF point is right on the eye wouldn't matter.
Looking at it from the other side, something like a Canon R3 claims every pixel is an AF point (~24 million) with almost 5,000 selectable, and there is nothing special at all about it's AF performance relative to other flagship bodies with a fraction of the advertised AF points.
It was a bigger deal in the DSLR days if comparing a camera with, say, 10 AF points to one with 50AF points, because there were sizable gaps to fill between the AF points that directly affected tracking performance or your ability to easily compose a shot. Modern mirrorless cameras don't really have that problem as most or all of the sensor is covered with plenty of AF points. More is better all else equal, but in my experience anyway, the point at which it doesn't really matter anymore is fairly low.
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