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
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52mm NDX Variable Range Neutral Density Fader Filter Adjustable from ND2 - ND1000 for Olympus Evolt E-620 - Walmart.com
Amazon.com : 46mm ND Variable Neutral Density Filter for Olympus 12mm f/2.0 ED Lens : Electronics
52mm NDX Variable Range Neutral Density Fader Filter Adjustable from ND2 - ND1000 for Olympus Evolt E-620 - Walmart.com
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