05-12-2011, 09:30 PM
[quote name='popo' timestamp='1305218302' post='8267']
But the SLTs are phase AF like SLRs. I'm all for accurate AF, but the other side is speed and tracking accuracy before you can start to think about retiring SLRs. I'd love the Panasonic contrast AF speed even, but I'd rather have it in a Canon or Olympus body... <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />
Like the old saying "use the right tool for the job". Panasonic contrast AF speed is excellent, but it is a long way from replacing a DSLR in all applications.
An interesting note on the Panasonic web page, they say the AF is faster as they are sampling faster. I wonder if that would simply scale to DSLRs also. I assume they work in live view/video mode, perhaps up to 60fps, but if the sensor were designed to work at higher framerates, that could help improve contrast AF speed on them too?
[/quote]
***edit, I completely misread your post, you were referring to contrast af mode on DSLR's, my apologies***
Others will correct me if I'm wrong, but how I understand it, there's no such thing as sampling rate in phase detection AF. It's rather a "one time measurement" of phase difference then translated to a defined amount of focusing lens movement. So I'm not really sure what more could be done here to gain a remarkable of magnitude of improvement.
It seems to me that moving to "final image" based analysis (e.g. based on actual imaging sensor feed, contrast AF) would allow to put a lot more intelligence in scene detection (including tracking) as processing power keeps rising.
Greetings,
S.
But the SLTs are phase AF like SLRs. I'm all for accurate AF, but the other side is speed and tracking accuracy before you can start to think about retiring SLRs. I'd love the Panasonic contrast AF speed even, but I'd rather have it in a Canon or Olympus body... <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />Like the old saying "use the right tool for the job". Panasonic contrast AF speed is excellent, but it is a long way from replacing a DSLR in all applications.
An interesting note on the Panasonic web page, they say the AF is faster as they are sampling faster. I wonder if that would simply scale to DSLRs also. I assume they work in live view/video mode, perhaps up to 60fps, but if the sensor were designed to work at higher framerates, that could help improve contrast AF speed on them too?
[/quote]
***edit, I completely misread your post, you were referring to contrast af mode on DSLR's, my apologies***
Others will correct me if I'm wrong, but how I understand it, there's no such thing as sampling rate in phase detection AF. It's rather a "one time measurement" of phase difference then translated to a defined amount of focusing lens movement. So I'm not really sure what more could be done here to gain a remarkable of magnitude of improvement.
It seems to me that moving to "final image" based analysis (e.g. based on actual imaging sensor feed, contrast AF) would allow to put a lot more intelligence in scene detection (including tracking) as processing power keeps rising.
Greetings,
S.