I get there are probably not too many people shooting the 13, but I wanted to ask - does anyone have the rear filter piece that they could measure the pitch/size of the threads?
I'm betting I could 3D print a small insert for attaching gels/filters, but I don't see much threads to measure. It might even be that this filter is standard across other lenses? Like the 16mm fisheye?? Does anyone know on that?
(Pic from another post off here as I'm missing that filter)