The second c-mount lens I am testing now, is the WA Kodak Cine-Ektar 15 mm f2.5
This lens does not cover the sensor, it projects a circular image somewhat bigger than the shortest dimension of the sensor. However, I found this lens to be knife-sharp, and with the manual focus adjust of the G1, quite easy to use.
I decided to take advantage of the circular image to take this picture :
Some minor corrections to exposure level, cropped a little, converted to monochrome and added blacklevel in Silkypixs.
In PSP Photo X2 : added borders
I hope you like it !