A6000 vs. A77ii Continuous AF - Very confused

Started May 14, 2014 | Discussions thread
VirtualMirage Veteran Member • Posts: 3,956
Re: A6000 vs. A77ii Continuous AF - Very confused

Corpy2 wrote:

VirtualMirage wrote:

Corpy2 wrote:

Now I'm really confused.

I needed another camera for certain shooting situations since my E-M1 really does not do great continuous Autofocus (though it's pretty darn godo in other ways). So I was thinking of the upcoming A77ii. But now I see the A6000 has virtually the same specs. Same APS-C, almost same frame rate, and (maybe?) same continuous autofocus capability.

So what's the deal here? The A77ii is almost double the cost of the A6000.

Can someone please explain? What's the dif?

  • Bigger body, more materials.
  • Better build quality with weather sealing.
  • IBIS.
  • Higher resolution EVF.
  • Better LCD screen (RGBW vs RGB).
  • LCD screen has more articulating points.
  • Dedicated PDAF sensor allows continuous AF even while the shutter is in action.
  • Higher frame rate.
  • More buttons, dials, and inputs.
  • Faster max shutter speed (1/8000s vs 1/4000s).
  • Greater flash sync speed (1/250s vs 1/160s).
  • More powerful built-in flash.
  • Probably a longer shutter life (150,000 vs speculated 100,000).

There are probably a few other things I am missing, but this is a quick run down.

Thank you.

What does this mean: "Dedicated PDAF sensor allows continuous AF even while the shutter is in action"?

If one is in continuous mode, and holding down the shutter, and shooting, is one not always in "in action?" How would the a6000 not be doing this?

On the A6000, since the AF sensors are directly on the sensor they cannot maintain focus during exposure since the shutter will be in the way of the AF sensors.  Because of this, there will be blips during exposure that the camera cannot focus.  So while it may be able to pickup back up quickly between shots, it cannot maintain constant focus at all times throughout the whole image exposure process.

The A77 and A77ii, on the other hand, can since the AF is being performed by a dedicated sensor that has nothing blocking it during exposure.

It's an advantage the SLTs have even over SLRs since on the SLR the mirror movement during exposure prevents the camera from focusing when the shot is being taken.

While we won't know what the real world difference in AF tracking performance is between the A6000 and A77ii until we can directly compare them side by side, the design and theory of peak performance favors the A77ii.

Small movement changes during fast exposures their may be little to no difference between the two.  But large or fast movements during fast exposures and movement during longer exposures should lean more in favor of the A77ii.

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