@zigizigi

Here are the stills from your animated GIF. As you say, ETC shows a couple of degrees less skew. It's good to have this. However, there is more motion blur in one than the other and that's not something we should be happy about. You'll probably continue to have some problem with velocity variation using along with the simultaneous difficulty of the GH2 grabbing a frame at the same point. However, more samples are good. For consistency I've done the angles again, maybe more precise this time. [Edit 6 May] Have corrected Image 2 (ETC ON), sorry, I'd forgotten to switch the angle line to the rear after the horizontal flip. See corrected image ETC ON as #3]

@Rambo

What made you think I have a theory? I use Libre Office Draw (Linux). As I said, I'm doing my best with blurry samples. I often return to the drawing and find I need to make another adjustment, only to return to the same place. I find that the contrasty yellow line completely obscures the blurry pictures next to it. However, removing the angle-line reveals what is, after all, a definite edge to the skew in the photo. I often seem to place the vector angle line back where it was anyway. I am now trying to offset the vector line to one side of the picture so as to invite scrutiny. Please try it yourself and compare.

But I see what you're saying. It would be best if @zigizigi 's pics were posted unlabelled as some semblance of true double-blind practices. Like this:

(Is it just me, or do these look like different camera angles?)

I disagree Roberto, I'd much prefer to see the camera tested in the mode we'll use it in. Who knows what witchery that might be introduced in extreme framerates. This is why I was also against noise tests done with the lens cap on. The guy who did that eventually repudiated his own findings based on more thorough real word testing.

@Brianluce Agreed. I am looking forward to your test in the mode you'll be shooting in! :-)

Roberto, hopefully this is obvious to you, but you'll need to capture images of the barrel at the same phase of its rotation.

If anyone has access to a professional vinyl-record turntable, you will find this testing easier to calibrate with the checker-board disk rim & variable speed knob. (I can't seem get one here). I really would like to see lots of comparable samples. Any wild deviations can be averaged-out and a pattern will emerge. My own barrel is turntable-size. Its 24 cm diameter provides a near-flat surface at the point of skew while still enabling a convenient 1.3 meter distance to sensor plane. In order be able to do dozens of clips at each setting, I'll need to speed up the process, hopefully by adding a bar with angle-of-skew calibration marks at the bottom of the barrel. That will cut down all this image-grabbing in post.

My results should all be posted in a spreadsheet (no, I won't be cherry-picking some and conveniently forgetting others) and just a few, typical videos or pics posted. If others do the same, we've got some seriously powerful fast-testing happening here!

@Rambo

Don't scrutinise me personally. But if you can, please help constructively.

Those who can, do. Those who cannot, teach

Will you be contributing via experiment or armchair? ;-)

Great discussion, as it goes I've always thought that the rolling shutter skew was a lot less in ETC mode. Also the Foundrys recommended values for their plug in to fix rolling shutter seem to suggest less correction is required in ETC mode, but things are different with 720p. http://www.thefoundry.co.uk/products/rollingshutter/training/

There is a good reason why this tests should be done at a higher shutter speed. That is because shutter speed has no affect on it. For instance if a faster shutter speed produced less of an affect then you would barely see the affect at 1/4000.

The pictures I took at 1/4000th has the same angle as the ones at 1/250th and other ones that I took at 1/125th and 1/60th.

The two things that really need to be tested here are ETC on and off for 720p and 1080p with a shutter speed of 1/4000th. I really think that the spinning can idea will work the best with a single camera. That is the most repeatable thing I can think of.

Hi!

I got some strange banding / noise in EVC mode. It's always visible in the dark areas of the video. Anyone know if this is normal or if my camera is broken? Could it be wrong ISO setting or any other setting i'm not aware of? I have tried different objectives but same result every time... (Panasonic Lumix 20mm 1.7 for example)

The artifacts is clearly visible on a original file:

http://janssonmusic.com/download/GH2_-_ETC_bad_quility.zip

Settings: Quantum - Sedna C Setting - Q20 version.

Frame rate: 24p

Shutter speed: 1/50

F: 8

ISO: 160

Objective: Canon 50mm 3.5 Macro with adapter

Thanks for your reply mpgxsvcd! I used ISO 160 when I did the recordings. I have read about some ISO bug, but I havn't found any information regarding it. Dynamic range is off. I have just tried Smooth with -2 on all settings.

When i'm not using the ETC mode, my picture quality is fantastic. So, I just wonder why it gets so bad in ETC mode... I think it's a nice feature, but unusable for me at the moment...

Hi,

Can I ask you ... ........ if is possible to use this Tamron CCTV len (Tamron 4-12mm F1,2) on hacked G2 ? Because hacked G2 have ETC mode like GH2. Is the same ETC mode on G2 vs GH2 ???? So is it possible to use ?

Thanks

It seems to me that @Roberto 's pics say it all with there being a slightly smaller angle of skew using ETC.