On-sensor PDAF, will it be as good as mirrored cameras?

Started Oct 10, 2013 | Discussions thread
EinsteinsGhost Forum Pro • Posts: 11,977
Re: On-sensor PDAF, will it be as good as mirrored cameras?

havoc315 wrote:

sybersitizen wrote:

BTW, would anyone like to speculate on the unique benefits of a mirrorless A-mount (not E-mount) design?

Not sure what unique benefits a mirrorless A-mount could have that wouldn't be equally possible in an E-mount design. The cameras could essentially be identical, except for a different physical mount.

1- Why are we seeing a flurry of f/4 zoom lenses for E-mount, as opposed to f/2.8?

2- Why are we seeing "acceptable" AF speed with E-mount, but the expectations are higher for A-mount?

3- Why did we see camera body size for SLTs grow from A55 to A77? And while at it, A3000 is closer to A55 in terms of size, but that already entails a lot of air-space. Imagine it growing further into A77 dimensions.

4-Compromises. E-mount isn't perfect solution to every problem. And neither is A-mount. But, they can complement each other very well, without the need to maintain substantial differences between them.

A theoretical unique benefit of a mirrorless A-mount, which would have room in the camera body in front of the sensor --- is either built-in camera filters, or a built-in lens dust cover. Other than something like that, I don't see any benefits that would be unique to A-mount over E-mount. IBIS may be a unique benefit in comparison to E-mount, though it's not unique to mirrorless -- as Sony A-mounts already have IBIS.

5- And of course, IBIS. Many expected IBIS in FF E-mount, but that is another area where Sony may prefer to keep the systems to complement each other. Is optical stabilization better? Or, is IBIS? This can be debated to no end, and if Sony has developed E-mount around optical stabilization, I see them continuing to develop OSS lenses, instead of doing that AND offer IBIS as well.

So what new unique benefits would a mirrorless A-mount have, that aren't already present in A-mount dSLTs, and aren't possible in E-mount cameras? Hard to think of much.

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