- Launched: October 2007
- Type: Digital SLR
- Sensor size: Four Thirds, 17.3 x 13mm
- Resolution: 10 megapixels
- Lenses: Four Thirds
- Key features: Articulating LCD, Dual card slots
- Links: Press release, Product page
Summary: Olympus's previous professional Four Thirds format SLR, now superseded by the E-5.
