Got hold of the 4/3 Olympus 14-35mm, its a really, really amazing lens. Yes, the iris flicker is a drawback, but I do not zoom around anyways. (Thanks for the info about 2.8, did not recognize that!) Focus breathing is very low and even at 14 mm you can get your subject devided from background which is gently and elegantly blurred. Well, you know the specs from above.

Now on the two real drawbacks:

This lens is huge and very heavy. You don´t believe it until you hold it in your hand, this thing is like a brick. The cheap MFT mount plus the adapter add quite some play, so don´t even think about using this lense with a FF without an additional mounting point in the front. You could try to focus by hand, but due to the play you will as well easily add shaking to the picture. Sadly there is no matching lens support from Olympus available, at least none that encircles the lense completly and keeps it tight in position. So you will either need to buy one of those.. http://store.zacuto.com/studio-19mm-locking-lens-support.html .. of get one crafted as we did. Now this thing gets into the way if you want to use another, shorter lens, so you have slide of mattebox to get it out of the way on lens change... well, you get the point.

The second drawback is the amount you need to rotate the focus ring to get from closest to infinite. While on many foto lenses the way is much to short, on the 14-35 it is really a bit to long. So you need 1.5 full turns on FF to get from closest to infinite. This can not be done with one hand. Might get a bigger gear wheel for the FF, but you still you run into problems if you want to do fast move from something far away to something really close.

Beside these drawbacks I would really recommend this lens. Its a working horse indeed!

GH2 Lenses with Adapter and Auto Focus?

It has been mentioned on this topic that all the lenses listed  by DPowell work with auto-focus. However, all these lenses with the  exception of the Panasonic, require adapters. How is it possible that a lens requiring an adapter can work GH2 in  auto-focus? Could you clarify this for me. I'm really confused about. Thanks 

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astraban, thanks a lot for your response clarifying this. I really appreciate it. Now can purchase one being more confident about it.

Ok... I just received the Tokina ATX-Pro 28-80mm 2.8 Nikon Mount lens:

http://lensbuyersguide.com/en/lens/show/Tokina/AF28-80mm_f2.8_AT-X_PRO

• Manual aperture ring: Yes
• Direct-coupled focus ring: Yes
• Proper focus ring rotation: Nikon direction
• Non-rotating outer barrel: Yes
• Non-extending outer barrel: Yes
• Constant field of view: 80 Yes, (Closer to 28 breathing is noticeable)
• Constant f-stop aperture: Yes
• Rotational zoom ring: Yes
• Parfocal zoom: Yes

Fixed... Got a bit too overexcited... Really nice lens...Will be using this lens in the theatre for sure.

Well I would like to get mine serviced before I cast a final verdict. The lens 'is' Parfocal with focus holding all the way through the zoom range, however the zoom is not as silky as I would like. (Read: its silky - but I want it to feel like an air hockey table) Just me... :-)

Also my copy feels like its been well used... (optics perfect but F mount is down to base metal)

PS: this lens is a composite lens- very light compared to even the 35 Samyang... next on my list: 80-200 Parfocal (Nikon mount whatever brand - as long as Parfocal don't care) Super Wide Zoom, (most probably 11-16 Tokina) Something Fisheye...

@nomad

"But you won't find any photographic zoom in that range which is not changing it's length, and quite a bit!"

Its crazy enough that the 28-80 Tokina is an internal mech!

Canon FD, Pentax, M42, Minolta – most anything but Nikon focuses in that direction.

I've went ahead with the sigma 20mm 1.8 based on all of this information, for my GH2. Nikon mount, and a nikon to m3/4 adapter. Though I'm curious how it would measure against the panasonic 25mm 1.4 prime.

The Tokina 11-16 lacks a manual aperture ring (you would have to use a Nikon G-adapter which wouldn't show aperture size), but there is a Duclos modded version, but it would set you back $3500...

However with a Nikon G adapter, you still adjust the aperture, you just can't see the opening. On a wide-angle this is much less important, as depth-of-field is fairly big and wouldn't make too much of a difference.

I have a Canon EF 50mm f1.8 legacy (assuming it's manual focus) -- and they have EF to M43 from Fotodiox. I shall check it out and see what it can do for my GF2 (I'd have to 'shoot without lens').

How about a Canon FD 50mm f1.4 would it be parfocal as well and will it work with my GF2?