...or whatever Nikon chooses to call it. I'm talking about something like this.
Essentially, it's an "anti-teleconverter," or a wide-angle converter. Think of an FT-1 but with optics that effectively reduce the focal length of the attached lens (instead of increasing it, as a teleconverter does). This is possible because the image circle of the lens (FX or DX) is much larger than the sensor and thus could fully cover the sensor even if shrunk down optically, thus effectively widening the field of view of the lens.
The announced product I linked to above performs a 0.71x conversion. Not only does that make the lens "wider," it makes it faster by increasing the effective aperture by a full stop!
Imagine what something like this would do on a Nikon 1 body. With the 0.71x of the "FT-2" and the 2.7 crop factor of the Nikon 1, the 35-mm effective focal length of a lens would become 1.9x -- like having a 1.9x crop factor.
10-24mm f/3.5-4.5 becomes 19-46mm f/2.5-3.2
28mm f/1.8 becomes 53mm f/1.2 (Back in the manual focus days, Nikon made a 55mm f/1.2 lens.)
35mm f/1.8 becomes 67mm f/1.2
300mm f/4 becomes 570mm f/2.8
And for really crazy (and expensive):
24mm f/1.4 becomes 46mm f/1.0 (How's that for your low-light shooting?)
400mm f/2.8 becomes 760mm f/2.0
The announcement says nothing about a possible third-party product for Nikon 1, probably because Nikon isn't giving out the engineering specs for the CX lens interface. But Nikon could surely make such a thing, and whether they called it an FT-2 or something else, I'd want one!
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