thecook

Well depends on how you view things. Compared to 35mm full frame used for photography, the gh2 has a crop factor of 2x. But since we are in the world of filmmaking, the standard is super 35mm which is smaller than full frame 35mm, s35 has a crop factor of 1.5x, thus this is my "full frame" Hence I consider this my 1x, and full frame to be less than 1x.If you are trying to match a 5d then you do the 2x crop if you are trying to match, s35 or aps-c, then you do a 1.25x crop.

You can always adapt nikon lenses to ef with full aperture control but not the other way around, that is why I buy almost all my lenses in Nikon mount. 
 
The play in the release button is normal, every pocket camera has it. 

I plan on getting the sigma 18-35mm f1.8 in a nikon mount as I plan on getting a blackmagic cinema MFT camera in the future and using it with a nikon to MFT speedbooster. However I am currently shooting with canon cameras and was wondering if this adapter will work even though the tech specs for the sigma state that it uses a Nikon F mount. http://www.amazon.com/Fotodiox-Adapter-D-Type-EOS-Camera/dp/B008BBIBOM/ref=sr_1_1?ie=UTF8&qid=1384817119&sr=8-1&keywords=nikon+g+to+ef