What is the best m43 for focus tracking?

Started Mar 31, 2013 | Questions thread
Anders W
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Re: What exactly do you mean by focus tracking ?
In reply to Fredrik Glckner, Mar 31, 2013

Fredrik Glckner wrote:

Anders W wrote:

Fredrik Glckner wrote:

axlotl wrote:

I have tested both the EM5 and GH3 but would not care to say one is better than the other at follow focus. They are using the same sensor (probably)  the same readout rate of 240 fps and both use CDAF without PDAF,  so there appears to be no pressing reason why one might expect one to be better than the other.

Just a note that the GH3 240fps AF readout only works with the Lumix X 12-35mm and 35-100mm lenses so far, and probably it only works in farily well lit situations, e.g., daylight.

That it would work at 240 Hz with these two lenses only is news to me. What's your source for that claim?

Here's a copy of the GH3 specifications, note the asterisk #1:

"The DMC-GH3 provides sensor drive and lens control at the speed of 240 fps, *1

*1 As of September 17, 2012, using a LUMIX G X VARIO 12-35mm / F2.8 ASPH. / POWER O.I.S. or LUMIX G X VARIO 35-100mm / F2.8 / POWER O.I.S. lens.

Source:

http://www.domuswire.com/prodotti/schede/panasonic/11095181.pdf

This appendix is often lost when people copy the specifications into reviews and so on. I guess this is partially intentional: If people think the 240fps applies to all lenses, the camera sounds better.

The 240fps AF feature was available only after the firmware 1.1 upgrade for those lenses:

http://www.imaging-resource.com/news/2012/11/01/fast-focusing-firmware-on-the-way-for-panasonic-zoom-lenses

With the original 1.0 firmware, you had at most 120fps AF control.

I see no reason at all why the AF frame-rate would be lens-dependent.

I disagree with that.

So what would be the reason that AF frame-rate would be lens-dependent?

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