uh oh, no A7000...?

Started Feb 13, 2014 | Discussions thread
jpr2 Forum Pro • Posts: 15,412
re: the APS-C has one very important, distinct advantage over FF...

parallaxproblem wrote:

jpr2 wrote:

...which somehow got and still gets overlooked by most (perhaps due to a very poor AF so far - till yesterday, and even that is till in a need of a very good body of actual experiences; the gross majority of Nex'en users were recruited from the ranks of UWA/WA and normal FL ranges) - namely the reach advantage:

  • to have the same reach as e.g. 400mm (and about 1-1.2 kilo weight) on APS-C;
  • one would need a 600mm and 3 kilo (or more) monster on FF;

so, NO... FF A6 will never be the same as N7 mk-II - not for a pretty substantial number of prospective users Which of course are already craving the same excellent level of external controls and UI as they got on N7-classic.


Totally agree, but I wonder if Sony are trying to sell us the A79 for that purpose, as currently there are no E-mount lenses that take much advantage of the extra APS-C reach, and the E->A-mount adaptors probably won't support the new speedy PDAF on the A6000

There is talk of very high MP FF sensors in the works (54MP?) which in theory would offer the same crop potential as a 24MP APS-C sensor, though at a price!

I don't want to see APS-C replaced by FF as I appreciate the smaller and cheaper lenses (and if feels 'wasteful' using them on an FF body in 'crop' mode) and the (currently) smaller (un-humped), and cheaper bodies. I'm just trying to interpret what I see from Sony, though of course I could be wrong.

I think that a6k is going to be grossly successful - that is provided that the preliminary findings of its lightning speed AF get confirmed with other than very light-weight lenses as well.


Also - as a digression, there is a standing question of AF's accuracy - at 11 fps I don't see much space left for a CDAF performing its usual routine of tiny-weeny steps, vacillating around the critical focus position between each consecutive frame - simple there is no enough time for CDAF to do so.

Which means, the speed advantage must be mostly due to the fast CPU (Bionz X), and a very reliable predictive algorithms = quite accurately telling the lens each time where to go in just one very quick, single sweep. A decades-old, well proven, PDAF-classic trick !! Minimizing potential problems due to latency lags, and mass hysteresis.


In other words, the predictive artificial intelligence - esp. for very fast action shooting & tracking, must rely much more on PDAF-part than on CDAF, thus the hybrid-AF solution as known from N6/5R is much less hybrid in a6k than we're accustomed to think given the past experiences,


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