I'm not quite sure why this lens needed its own holder setup. Irix might make some money here, sure, but its just a Lee knockoff. One would imagine that if you got a 95mm WA adaptor ring, a stock Lee 100mm/Foundation setup would work just fine.
And seeing a Lee-like adaptor ring in this new holder design, I have no idea how 15mm FF will be supported with standard 100/150 filters. Lee's manual would imply that 15mm FF + two 2mm filters would all but certainly vignette.
But hey, new system. Have a look.
- A