i got my adapter for old c-mount lense on my nikon V1
the lens was 28 bucks on ebay. its 25mm at f-stop 1.4 ! on the V1 sensor it would be like 62mm.
the lens wide open give full bokeh but also large distortion on the corners, but if wanna sharp result i will use the nikon1 lenses.
anyway, the result have interesting retro look for portraits: