@theconformist @tinyrobot I have two Novoflex Nikon to MFT adapters, and both let me use the aperture ring on my lenses that have them. You have to set the Novoflex to the fully closed position. (Towards the smaller circle.) They might be expensive, but the quality is superb.

Got my Novoflex today and boy was it worth the extra money! Rock solid and perfect focus to infinity compared to my first El Cheapo adapter from Ebayland. Those who buy cheap buy twice!

Hmm. Maybe my (quick and dirty) comparison below helps someone. It´s a bit long (like all of my reviews / comparisons), but also shows a cheap alternative to the Novoflex (-> the Big-Is adapters). So check them out if you are searching for a cheaper option. ^^

Well - A infinity adjustment would be great yes. Too bad that it´s not a standard feature =/ ... About the big_is adapters: I don´t know what they´ve done to their shop. But I cannot see any of the adapters with my standard browser. I only see it with a browser, where I am not logged in (to my Ebay account). Maybe they limited the possible countries (unwanted). Who knows.

Here are the Nikon adapters of big_is:

http://www.ebay.com/sch/m.html?_odkw=&_osacat=0&_armrs=1&_ssn=big_is&_trksid=p2046732.m570.l1313.TR0.TRC0.XNikon.TRS0&_nkw=Nikon&_sacat=0&_from=R40

I use the Voigtlander Nikon F to m4/3 adaptor. Smooth as yoghurt

Nikon AF and Nikon APS-C is the same (according the AT-X Pro 11-16mm F2.8 Tokina). It´s btw. a "DX" lens. So calculated for the APS-C sized sensors. Nikon F is the general mount. For manual AND autofocus (AF) lenses. Nikon F is btw. also used for the full frame system / lenses (so no difference like with Canon EF and EF-S for example).

Nikon G to micro 4/3 speed booster (from metabones) should work. BUT if I remember right, it´s not the best image @ full open aperture. So it´s also ok, if you go with a normal standard adapter only (without any focal reducing optics). Btw.: You can also try out the way cheaper RJ lens turbo focal reducer (you can get it here in the forum in the VK-Deals quite cheap). The optics are not as good as the metabones. But it seems usable with the 11-16mm F2.8 (slightly stopped down) - And it´s WAY cheaper than the metabones version.

About the size of the lens: APS-C is ok for the focal reducer (both - Metabones AND RJ lens turbo - on micro 4/3). And also full frame lenses are working flawlessly. You just need full frame lenses on (for example) the Nikon G to Sony E mount adapters, because Sony is using a APS-C sensor (which is way bigger than the Micro 4/3 one of your GH3 - So you need lenses with a bigger image circle to match the Sony APS-C sensor size ^^ - I hope it´s clear what I am meaning.).

For more information on the RJ lens turbo check out the thread here in the forum ^^. There is also a video with the 11-16mm in Lucas Pfaffs channel (just watch the full video - The 11-16mm is visible btw. at 9:45 - But better watch it completely):

in other terms, does it have an aperture ring that gradually pushes the mechanical system of the lens, like the metabones speedbooster? If it does, is it declicked?

Yes, if you talk about Nikon G to m43 adapter :-)

+1 to Metabones Nikon G -> m43

Didn't know what I was missing! (my other 'no-name' mounts a pretty much lensbabys compared to this!)