Amazon.com : 62mm Variable Neutral Density Filter for Olympus 7-14mm f/2.8 Lens : Electronics
Olympus OM SLR Lens to Micro Four Thirds (MFT, M4/3) Mount Mirrorless Camera Body Adapter, with Built-In Variable ND Filter (2-Stop to 8-Stops) – Fotodiox, Inc. USA
Amazon.com : 52mm Variable Neutral Density NDX Filter for Olympus Evolt E-500 : Electronics
ND Filters and Long Exposures with Olympus cameras - Olympus Passion
ND Filters and Long Exposures with Olympus cameras - Olympus Passion