Jesse Lim: “I Have a Dream – Mirorless A Mount with on Sensor PDAF?”

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Our reader Jesse Lim raised an important aspect of the future A-mount strategy. And his “dream” could really become true in the near future:

I Have a Dream – Mirorless A Mount with on Sensor PDAF?

I know this might sound ridiculous or not economical realistic, or technically impractical, but as a long time FF A mount user who haven’t made the move to FE just yet, I always had this thought in my mind.
I was wondering will Sony ever consider making the next FF A mount body mirrorless with on sensor PDAF? If so, it will be great beause I don’t like the idea of adding a LA-EA4 between my lenses and the FE body since I have bad experience with the A77 and its SLT mirror.
Do educate me if I’m wrong because for the last few years, CDAF on mirrorless seems to be fast enough to compete with traditional phase detection AF (Well, at least for a portrait photographer’s pont of view). My OM-D EM-5 focus as fast or faster than my A850 / A300 and it is using only CDAF, of course m43 have a deeper DOF thus much more easy to focus. And the A6000’s4D Focus seems fast enough to fulfill many photographic challenges.
So, if FF E mount can achieve adequate AF performance with I don’t know CDAF? Why can’t A mount just be made the same way while be able to maintain legacy lenses mount without adapters and the beefy ergonomics I like because in my experience I tend to grip more harder on smaller bodies, which is not comfortable.

A Mount = Mirrors, Traditional Ergonomic, Bigger Battery,
     E Mount = Mirroless, Compact Form Factor ?
             The Mirror, it is still necessary? Flange Distance, Achilles Heel? T

he Paradox always kept me thinking… or maybe I’m just plain silly…

For 2 mount system with identical sensor size (Different in flange distance of course), what is the best strategy for Sony to differentiate both product rage while both series are getting more and more convergence in terms of IQ, feature and characteristic for each iteration of product release. Of course if the key factor is the flange distance which ultimately decides the ease, size and quality of the lens designed for both cases (I don’t know, longer flange distance is better or the shorter one for the long run? do let me know)
Imagine fitting the entire A7mk2 architecture inside a A99 body size, with less volume/size constrain to worry with, Sony can really go creative with A mount system with ample amount of card slots, ports, dials & knobs real estate, and maybe fitting in a bigger EVF, Display, bigger buffer memory, on-board storage and file manager, bigger heat sink for sensor thus 4K with 5-axis IBIS… I don’t know, creativity is the limit.

Anyways, just sharing my thoughts~ no biggy~ and cheers~

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First posted on SonyAlphaForum.

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