I have gone as far as take this lens apart to get the iris declicked . So feel free to ask me any difficult questions about the lens. This lens is very special.
Alongside other common characteristics of flares, color. The front of this lens can move in a 2-Dimensional, omnidirectional, but turning the side nob and rotating the lens both to adjust the corrected rectilinear effect for an alignment of objects of light bent to your liking.
Aside from rotating or bending the depth of field. You can also alight the curvature of distortion to an angle that makes surfaces more or less distorted or exaggerated .
This entire lens set is in EF with focus, iris and zoom gears and 77mm inner diameters and 80mm outer diameters.
They will cover Full Frame, Super 35mm and m4/3 sensors.