OM 12-50 Lens and Lee Filter System
I know this is a vey old thread, but I'm in the same situation. I have the Lee holder for 100mm filters and several filters that I was considering using on the E-M5. Seems a bit of overkill size wise, but with the right adapters it would work. and I'm wanting to add a R72 filter to my kit as well so I need to know if I'm sticking with the system or ditching it.
I have the Panasonic 12-35 on order which uses 58mm filters so I can use the wide angle adapter in that size. Problem is I'd like the option to use it on my 25mm, but that's a 46mm and they don't make adapter that small so I'd need a step down ring.
Anyway, to your question about the wide angle adapter, I can say that on a DSLR with a 24mm lens you would want to use the adapter.
Did you ever get/try it?