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.

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%.

Right for pictures.... gotcha!

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

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

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.

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...

@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 ;)

@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

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

I've already sent in my lens to the service center in Texas. I'll update the thread when I hear something.

@johnmw Is this for any region of the world?

Thanks Amin, I have already been contacted by a Panasonic engineer from US thanks to you! Since I live in Tokyo and my lens is with Panasonic Japan he asked me a few questions and mentioned that he will get in touch with his peers here in Japan.

Great work, thanks again. Will post any news I have of course. By the way I haven't been contacted by Panasonic Japan yet.

From Amin:

"I've forwarded a bunch of emails from users all over the world to my Panasonic US contact who has either replied directly to the user or forwarded their email to the corresponding Panasonic contact in their specific country. At this point, he tells me that they don't need me to forward any more emails. They have enough information to go on, including having the lens from affected user(s) in hand to analyze. So please no more emails to me about this issue. I will update this thread and at Mu-43 if/when I have more info, which hopefully will be soon. John, if you wouldn't mind, please copy this message to the other sites so people know that I don't need to get more emails about this. Thanks in advance."