I am planning to compare Kinor6mm with Angenieux5.9mm and Kinoptik5.7mm.
The image of Kinor through view finder has little bit bigger amount of distortion than Angeniex, but is as clear as Angenieux.
I have OKS-1-6-1 6 mm super wide angle lens and have high opinion about quality of image.
But, last music video we shoot with russian Super 16 Fish eye Elite Optics lens 4.5 mm.
This is real fantastic lens. I recommend use of this lens too.
Yes, of course, the fish eye footages have specific look.
About modification of 6 mm lens mount.
I hope, you know, what this is " free focus " type of lens and have fixed position of focusing and have fixed adjusting of distance focusing 0.9 m. The OKS-1-6 -1 lens will have DOF distance from 0.45m
up to infinity.
If you wish, you can set other fixed distance of focusing .
The procedure of adjusting must have high precision, because, the additional ring with thickness 0.01 mm can change point of focusing too much.