If you happen to be a US owner, here's how to get started reporting the issue:

FORUM: http://shop.panasonic.com/shop/model/H-HS12035?support

EMAIL: http://shop.panasonic.com/ecom/support/contact-us?t=email

PHONE: Product Support and Technical Assistance 1-800-211-PANA (7262) Hours Mon-Fri 9:00 AM - 9:00 PM EST Sat-Sun 10:00 AM - 7:00 PM EST

@Nakame78 are You from Italy ? And how did you send the lens in Japan repair center ? I knew that European customers can relate only with european panasonic center !! this is what is written in the Global site. Anyway from Italy repair center I got three copy of lens already repleaced , and the issue still , so the only hope is about new firmware or Nakame78 Tokio's center developments

@valpopando sure I will post some updates as soon as Panasonic calls me back.

Usually Japanese firms are very sensitive to the reactions from their customers on the Internet, I will check Japanese forums as well to see if this issue is reported there as well.

btw I'm from Italy too ;)

Yesterday I took my lens to the Panasonic repair center here in Tokyo (it took me a bit to explain the whole story in Japanese) :) but eventually they said that if this is confirmed (and it is as we know) they might issue a recall for this lens. For the moment they sent it for "repair" and told me to wait a couple of weeks...

Guys, whoever has issues- don't hesitate to contact Panasonic service and claim, you have your warranty.

You've paid lot of money for that lens and it should work flawless. Each claim brings all of us closer to Fw update which may fix all the bugs you have to struggle with now.

I live in Japan and I bought the GH3 with both 12-35mm and 35-100mm lenses last December (the camera is available here but as you know only Japanese menu). After reading about this issue I've done the same test and.. unfortunately I have the same problem. I am now uploading the videos on Vimeo, will post the links later on, but there is a clearly visible jitter with 12-35mm @35 (same result with OIS ON or OFF), whereas if I use the 35-100mm lens @35mm there is no jitter whatsoever (with OIS ON or OFF). It will be interesting to see what Panasonic is going to do now.. I plan to send my lens to them via one of their assistance centers

Right for pictures.... gotcha!

Okay makes more sense, i only do videos or normal pictures.

Not that I don't believe what is being said in this topic, but are these tests in anyway related to practical filming?

I use two 12-35 X lenses for wedding films and have yet to see any noticable shake, jitter, wobble, zoom glitches, unnecessary focus breathing or even major distorting at wide and tele.

This lens is a fantastic triumph, beautifully sharp and extremely versatile for a lot of people.

Of course what I have said is purely subjective and my own opinion but i would worry that these tests may put some people off the lens.

Once again, i do not dispute the fact that this lens appears to have some issues when subjected to these tests, i just wonder if these tests represent any real-world scenario. Perhaps I am just naive to the fact that people like to view an image at 400%.

Regarding the 12-35 jitter thing -- I should note that the problem does not not appear in every shot. Even at 35mm and 45 degrees angled downward (not the limiting circumstances, but the ones that make the problem easily seen), I encountered the jitter in only about 2/3 of my test shots. It's probably limited to focus distance and other factors. I tested on two lenses, and the first lens was really, really bad. I could see it at 100% every time. The second lens I had and returned was better.

Probably the quickest way to test -- if you happen to own a GH3 -- is to view the image on your camera's LCD at 10x magnified focus assist while focusing at different close subjects at 35mm.

I know some people will disagree with me, but I believe that the jitter can cause moiré in some shots.

Damn you, @johnmw! ;) I tried what you said, and now I know my lens has the same problem as you :(. I had my gh3 on a small gorillapod lite (the ones for compacts - it can just hold my GH3) on a table pointing down at an object a couple of meters away at the floor, and then recorded in 1080p24 (.mov) mode for a while. OIS turned off.

Bringing the footage back up fullscreen with VLC on my 15" rMBP, I could not see any movement, except that some moire pattern on the object wasn't totally static. I then used the desktop zoom to zoom in 400% on the screen so the object almost filled the view, and there it was, clear as day. I'll have to redo the test with a proper tripod and a more suitable object in a better controlled setting before I upload anything though. I'll check the 35-100 @ 35 too, but the problem might only be visible at the 100mm end maybe and then I'd need a totally different test setup...

Hey everyone,

The jitter doesn't show much on level 12-35mm shots. But you will see the issue easily if the lens is point slightly downward.

SUGGESTION: If you are experiencing the 12-35mm jitter problem and have the time, please consider making a video and posting it to Vimeo or Youtube. We all know how search engines work, so please use a descriptive title, such as:

Panasonic LUMIX G X 12-35mm F2.8 ASPH problem: shakes on tripod even with image stabilization off (firmware v1.1)

As @valpopando said, the more the issue gets out there, the greater the chances are that Panasonic will see this problem and address it somehow.

To recreate the problem so that it is easily visible, simply set your lens at 35mm, place your camera on a tripod angled slightly downward (like 30 degrees) at a subject such as a book, etc and shoot.

BTW, I hadn't noticed this problem until I was doing some picture profile tests. (I just got my GH3 a few weeks ago, but am a longtime GH2 shooter.) But when I went back to scrub through older footage shot with this lens, once I knew what I was looking for I noticed it everywhere! I would hate to be using what I thought was a "good" lens, only to discover on an interview or product shoot that my footage was jittery.

Here is another example:

@valpopando Thanks for contributing. Really helps!

I exchanged the lens for a new one and still saw the jitter problem. I don't doubt that there are samples of the Panasonic 12-35mm lens that are OK, but personally I've come to the conclusion that this lens is not reliable mounted on a tripod.

(Best viewed full screen.)

Hopefully a firmware revision will fix this problem. But for now I am returning the lens and using the 14-140mm as the stabilized zoom in my kit.

@tetakpatak Sure is some kind of data transmission problems between CPU and lens , but I think that is a OIS issue , because the jiggling stopping for some seconds , after you make a slight movement of the camera , just when stabilization starts to operate . A technician of panasonic explained to me that even when the stabilization is turned off there is a magnetic system which holds stuck the inner part of the lens . In fact, if you try to wobble slightly the lens when is not mounted on the camera , You can hear a little noise, as something loose that moves inside the lens . But for a lens of 1200 euros is a shame ! sorry my English