Inon has listed its products that are compatible with the Olympus OM-D E-M1 mirrorless camera and PT-EP11 housing. These include accessories for strobe triggering via fiber optic, a variety of wet macro lenses and the Inon micro fisheye lens:
Inon’s Olympus dome (for use with the Olympus ED 8mm F3.5 Fisheye) can also be used with adaptors from Olympus (MMF-3,port adapter PAD-EP08 and port extension ring PER-E01).
In addition, Inon offers a macro port with a magnetic (MRS) focus ring system for the Olympus ED 50mm f2.0 macro lens.
In addition, the company is offering a range of light holders, grip bases and arms.
For full details, Inon lists the full system on their website