Why I feel Nikon might have their head in the sand concerning mirrorless and MFT:
"The MFT system design flange focal length distance allows for, through use of an adapter, the possibility to mount virtually any manufacturer's existing and legacy still camera interchangeable lens (as well as some video and cine lenses) to an MFT body, albeit using manual focus and manual aperture control. For example, many theoretically obsolete 35mm film camera lenses, as well as existing current lenses for APS-C and full frame DSLR's are now usable on MFT cameras. As an example, an older (i.e., used, obsolete and low priced), but still high quality, 50mm f/1.8 "standard" lens from a 35mm film camera can be used on a MFT camera body. With MFT sensors having a crop factor of 2.0, the old 50mm f/1.8 "standard" lens becomes a high-speed (although manual) 100mm f/1.8 telephoto portrait lens. So the MFT system allows the re-use of expensive lenses that may have outlived their 35mm film format camera, and can be used on a modern digital camera body capable of both still and HD video recording. Similarly, the MFT system design allows current DSLR lenses to be used as well, although only with manual focus and aperture control."
http://en.wikipedia.org/wiki/Panasonic_Lumix_DMC-GH1
And think about it. No stopping down problems with an EVF preview. Manual focusing that will be better than the original film or digital camera the lens was designed for, a very high resolution WYSIWYG preview that would have been a dream not too long ago and sensor IS to compensate for unavailable lens stabilizers.
Concerned about depth of field abilities? 10% is in the tools we use. 90% is in the knowledge of how to take the picture. I don't buy any significant differences between APS and MFT bokeh! They're nothing like the differences gained on medium format or even a 35mm full frame. If we weren't so loaded with zooms it would be more obvious.
I met a photographer at a photo trade show in NYC who used a Panasonic GH1. With FT and MFT adapters galore on the market already, he had some incredible collection of legacy lenses he'd been using on it, as many as a hundred if memory still serves : (
The vintage lens he had on the camera at the show was somewhere around an f2. It was that old chrome lens on a digital black plastic body that had got my attention! Memory does run out trying to recall which one it was but he also had a portfolio of images with him. I'm a pro artist and know something about images that make it to the show. Rest assured, the lenses played a roll in his beautiful results.
I'm still using Nikon F lenses with hopes of getting a D700 or even D3s but here's my point to Nikon, I'm currently using them on Fourthirds cameras! My 28mm f2.8 becomes a 56mm f2.8. My 40mm f2 Ultron becomes an 80mm f2... and on, and on.
If Nikon turns their nose up at such an incredible opportunity for lens adaption by customizing their mirrorless as an exclusive mount over a sensor size that limits lens use, they'll be at the mercy of a market trained on birthday cakes and cats... and I'll probably give up on any Nikon FX.
I don't mean to be too skeptical but at one time, Nikon was renown for adaptability in its system. This is one of the reasons I passed up on Canon years ago. I feel they'll create a mirrorless jewel in the end but when? An interchangeable range between MFT and FX would seem far more useful.
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BruceWB