idsurfer wrote in post #18355053
Holy Moly! I was discussing eye focus here the other day. My camera can't even come close to this. Honestly, it simply doesn't work for me. Tried it again yesterday with posed portraits ~10-15 ft away with a big fat no go. Conclusion...eye focus on a6500 is useless.
Eye-AF seems to work even better on the a9. I'm starting to think that there is more to the AF system than Sony is letting on. Someone in SAR pointed out that the specs on the sony website show that the a9 actually has a 28mp sensor, but only 24mp effective (only 24mp is used for actual imaging). My speculation is that 4mp of 'unused' pixels are actually dedicated for PDAF...similar to Canon's dual pixel AF. If this is the case, this should greatly improve sensitivity of the PDAF system since these pixels would not be sharing the light hitting these pixels with the imaging portion of the sensor....this is why adapted lenses crap-out in low light on current Sony cameras.
TMaG82 wrote in post #18355078
I think it depends on how far the subject is from the camera. For best results for eye focus, the face for me has to fill a significant part of the frame, anywhere from half the frame to about 25-30% of the frame. Far enough away and it will kick to face detect.
idsurfer wrote in post #18355079
So reliable for head shots and not much else. I guess I expected more initially after watching Gary Fong's video. In that he was taking full length portraits with an 85 mm lens using eye focus. He goes on and on about how awesome it is. Not my experience.
Eye AF still works for loosely framed subjects for me. i.e. those photos of my kids on the RX1RII were framed loosely with eye AF, and you can tell they weren't sitting still at all.
It will stop working if the subject's face is really small in the frame...it works for half body shots, but not for full body shots. At that point it drops to face detect, but usually by then the DOF is wide enough that critical focus accuracy down to the eye is less important.