| Concepts and overview | Flashphoto Group |
| Camera Body Group | Macrophoto Group |
| Lens Group | Phototechnical Group |
| Finder Group | Case Group |
| Please note: I've divided the components of the E-System into seven groups, using identical names as Olympus used for the OM System, and which I also used in the OM section of the Unofficial Olympus Sales Information File. These are logical groups, but currently not used by Olympus for the E-System. It does make the pages for the OM System and E-System more consistent. |