The Pen range of cameras use a Micro Four Thirds mount, all Olumpus E mount lenses will fit it using MMF-2 or the MMF-1 adapter and all the Olympus Om lenses will use the MF-2.
There are third party adapters to allow the use of most other brands of lenses to be used on The Pen.
Panasonic Four Thirds Mount lenses will mount directley to all Pen bodies.
