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GH2 Focus test in normal and nearly no light...check this video out...

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aloper

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Found this on youtube...it's in Russian ( I think ) and this person (I believe) is doing some focus testing with a variety of cameras. Some high and mid range Canon bodies, a Nikon and a few others. It's sort of long but if you move through it, he basically turns off all the lights except one and repeats the test he is doing. You will notice all the others cameras failing or struggling to lock focus in low light where it appears the GH2 isn't having a lot of issues....I think, again because I can't translate what is being said but check it out...

http://www.youtube.com/watch?v=m27Llopmp8g
 
I don't know anything about the testing parameters or how representative it is, but it sure looks impressive...

At first I was thinking maybe the 20/1.7 gave the GH2 an advantage, being faster - but in the setup up screen on one of them (the Nikon, I think?) I caught an F/1.2, so it isn't that.

The GH2 AF Assist light is visible in live view during focusing, and it didn't come on - he must have it (and the other cameras') disabled.
Walter
 
I did notice, actually (or at least that his upper torso is bare.)

While I didn't find that to be a positive aspect of the video, I wasn't sure how it would affect the ability of the cameras to focus. ;)
Walter
 
GH-2 autofocus is just amazing!

I found that I can focus in almost complete darkness with AF assist light turned off , and with 14-45 lens!
saghost said:
I don't know anything about the testing parameters or how representative it is, but it sure looks impressive...

At first I was thinking maybe the 20/1.7 gave the GH2 an advantage, being faster - but in the setup up screen on one of them (the Nikon, I think?) I caught an F/1.2, so it isn't that.

The GH2 AF Assist light is visible in live view during focusing, and it didn't come on - he must have it (and the other cameras') disabled.
Walter
Click to expand...
 
He compares several Canons and one Nikon (60?) with GH2
Competitors set to 'life view" mode
--
MFT in progress
 
The D5000 and the 1 series had live view, as you can clearly see him using it to frame the target when the lights are off. Actually now that I think about it the E3 obviously has live view too as does the 60D. I'm surprised he didn't try to use the CDAF on those cameras to see if they would have done the job as a last resort.

Very impressive showing from the GH2. Odd how he shoots without looking through the viewfinder though...
--
Cloverdale, B.C., Canada
Nikon D700, Panasonic L1, Olympus e-510
http://www.joesiv.com
 
I stand corrected.
Watched this video second and third time:
Cameras are Canon EOS1, 60D, 5D, Oly E3, Nikon D5000, GH2

Fist he checked AF in decent light - all cameras AF'd more or less fast, second time he switched off the ceiling light and left on some dispersed light.

Results: some cameras tried to focus without success (wiggled with motors), some did not react at all (E3). The best of the bunch was D5000 that focused once, but refused to repeat (he tried LV to locate sweet spot to focus, he tried single point, than multipoints)
GH2 is clear winner by knockout
--
MFT in progress
 
Most impressive. In low light the autofocus of the GH2 seems to beat the pants off of the competing DSLRs. Most of them don't lock autofocus at all. The GH2 appears to be only very slightly slower than in good light. He didn't even use the autofocus assist lamp, did he?
 
Kikl said:
Most impressive. In low light the autofocus of the GH2 seems to beat the pants off of the competing DSLRs. Most of them don't lock autofocus at all. The GH2 appears to be only very slightly slower than in good light. He didn't even use the autofocus assist lamp, did he?
Click to expand...
This is interesting as the author of another thread here says that he doesn't think the GH2 does as well with autofocus as his DSLR in low light:

http://forums.dpreview.com/forums/readflat.asp?forum=1041&thread=37356027
 
Larsbc is busy doing research about focusing on MOVING SUBJECTS. He wants to prove the common opinion that PDAF is good for BIF and sports while CDAF is not.

I have no opinion on this matter, but I'm positive that this is only matter of time CDAF to ketch up PDAF at this area too
--
MFT in progress
 
s_grins said:
Larsbc is busy doing research about focusing on MOVING SUBJECTS. He wants to prove the common opinion that PDAF is good for BIF and sports while CDAF is not.

I have no opinion on this matter, but I'm positive that this is only matter of time CDAF to ketch up PDAF at this area too
--
MFT in progress
Click to expand...
If you read the thread from Larsbc he also states that he feels the low light auto focus performance of his GH2 is behind his dslr.

From the other thread, quotes from larsbc: "I've found the single shot AF of static or slowly moving subjects to be very quick and accurate. As long as the light isn't too low, the focus is very, very good. In very low light, my D300 locks focus faster (and it doesn't have the time-lag that occurs when the EVF has to work with low light). "

and "So, AF-S: GH2 vs D300...

In good light, the GH2 felt only a bit worse than my D300. In poor light, my D300 works in lower light than the GH2. I haven't noticed a speed difference in acquiring focus lock in low light. I need another few weeks of using the GH2 and then my D300 to get a really good sense of how they compare as far as low light AF speed is concerned. "
 
Now there are two possibilities:

Either:

The autofocus of the Nikon D300 in low light is in a completely different league than the Canon EOS1, 60D, 5D, Oly E3 and Nikon D5000;

or:

He got it completely wrong.

The latter possibility seems to be far more likely. In my mind, this casts into doubt his overall assessment of the autofocus performance compared to the GH2. It would be helpful if someone else performed a test to confirm or refute the continuous autofocus performance.
 
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