06-30-2017, 10:18 AM
Quote:Dave, I made the mistake of thinking mirrorless were per se more precise in focus - also the focus points cover a wider area. All of that true. To a certain point...Yeah I've heard about this stopping down in AF-C mode, I must be missing something, but why?
All I say now is meant for Fuji, I don't know Âµ4/3 or Sony.
AF-C struggles, as it is not performed with open aperture, the lower the light, the worse.
The coverage is wider - but doesn't contain upper and lower horizontal border arrays.
325 focuspoints sounds great, but need time to scroll through.
The coverage of focus points is only valid with single points in AF-S. Other AF-modes don't show so much points.
I don't know if the A9 does it?
I must say that when I speak of ML AF, really I'm basing that on the A9 and not really any other camera (I know Fuji is also very good) but it's it's rapidity which updates 60 times a second grace of the stacked sensor.
I hark back to my Pentax days when I tested the K3, to check Pentax's claims for what was their new 27 point safox system.
I found that in the AF-C mode, what I call the "dead-band", the amount of subject distance change before the AF refocused was twice that of AF-S, evidently the system is downgraded/simplified in AF-C. No surprise then that the system gets a low hit rate following the action, not to mention what the re-sample rate is, it certainly wasn't anything along the lines of Sony's 60/sec.
I always thought that Pentax's AF-C problem was linked to that, also their claimed object recognition as used in Nikon's 3D mode was just pure fabrication, yes it could see the object but could only recognize it's distance, not it's form/colour etc.
Your last question JoJu,
I'm confused.. the mirror is already up in LV!.........but between systems all being equal, the on senor PDAF sets off in the right direction with no hunting, thus quicker. (unless I misconstrued the question?)