Putting the lens flat against the GH2's flange is probably making them too close to each other, preventing proper focus and making the image circle a little too small. They should be about 1 mm apart - the thickness of the C-mount adapter. Until you have the right C-mount adapter, experiment by holding the lens different distances from the GH2 until you get focus.

And make sure your ETC mode is working. Try turning ETC off. The difference should be obvious: with ETC mode off and the lens zoomed out, this lens projects a circle that covers only about a quarter of the GH2's sensor, with lots of black all around.

Make sure you have the mode dial set to Creative Movie, and you've selected a 1080 video mode in the menu (HBR, 24p, VMM, or 1080i). ETC mode has different effects depending on what photo or video mode you're in.

To check your lens's coverage, take a photo with ETC turned off and compare it to this. (GH2 4:3 large, 4608 x 3456; 8 mm f/2.8)

But mostly I wouldn't worry about it at this stage. It's very hard to judge most aspects of a lens's performance before it's properly mounted and adjusted.

Well, the promised snapshots - ETC OFF and ETC ON. Video Mode. Lens held by hand!

Again: the back black 6-screw part of the lens almost touches the GH2's flange, or just less than a milimeter distance for best focusing.

After many other engagements finally I modified my Canon TV 8-48mm 1.0 lens successfully and attached it to GH2 with thinner adapter.

But still there are vignettes on the angles of the image and I discovered that the reason is the hood of the lens which changes the vignetting when rotates during focusing.

Is there a way to remove the hood, is it detachable at all? I tried by my hands without success.

What's the verdict?

Should I buy this lens or my Gh2, and if I do, how do I go about modifying it? Also -- where do I buy it?

It's pointless using CCTV glass if you are using HD sensors. These are lenses built for SD/analogue, and can't resolve at HD resolution. Inevitably, you will end up with v soft images, unless thats the look you want.

Second that, @balazer.

@producer, others: Please link to the 1mm thin flange Cmount/m43 adapter, I've tried a couple and they didn't work. Thank you,

It will have to sink into the mount, so you may need to machine the rear of the lens down.

Sure. Something like this:

The screw locks the back focus. The shaft adjusts the back focus. Loosen the screw and then tighten it so it's just barely holding the back focus.

Zoom to the maximum focal length and focus on something. Zoom to the minimum focal length and adjust the back focus until the item is in focus. Zoom to the max and adjust the focus again. Zoom to the minimum and adjust the back focus again. Repeat a third or fourth time if you want. At that point the back focus is adjusted. Tighten the locking screw.

On this lens the back focus can't be set in a way that makes the lens parfocal for all focal lengths and focus distances. You need to pick the ones that matter to you and adjust the back focus for that situation.

The screw has threads and is hollow. The shaft is solid and smooth.