Processing:
This is one of the most unusual lenses I've ever had in your hand! It's not bad processed, the barrel and the bayonet are made of metal. The focus ring is very stiff and the aperture ring does not click (freely adjustable). The aperture is not circular but approximately round, square or a rectangle, depending on how far she concludes. The front part of the front lens you can simply unscrew (!). What is this good, I do not know.
Optical performance:
After the first pictures I realized that this objective has not been made for sensors with such a small pixel pitch, as is the case with the 1 sensor in the V1. Between the 25mm f / 1.4 Nikkor 18.5mm and the f / 1.8 in terms of field environments. In the 100% view of the C-mount lens is easily blurred, in addition it is very dull by contrast forth. You have greatly sharpen and pull the contrast knob to obtain a usable image. At maximum aperture there vignetting quite strong and the bokeh circles have these bright contours, making the Bokeh is very restless and unsightly.
Conclusion:
The 25mm f / 1.4 C mount lens is indeed light strong and has a focal length (converted 67,5mm) suitable for portraits, the image quality is far from good. The sharpness is in no way a Nikkor for N1 comparable, the contrast level is low, it vignetting quite strong and the bokeh is restless. The exemption potential is neat despite the small sensor 1, but without sufficient focus and a creamy bokeh lens is not worth more than it costs. As the Americans say so beautifully: you get what you pay for.