Sigma 80-200mm f/4.5-5.6 lens for Olympus OM "ebay om" Questions

...eBay and they do exactly the same thing as the ridiculously expensive OM original item. You will need to manually focus with the aperture wide open and then remember to stop down to the desired ...

All Manual focus. I have used Olympus OM mount adaptors with manual focus to mount older/different mount lenses with some success (As an example). Best idea is to search ebay for your mount converters

...ebay for mount adaptors that will allow you to use most older lenses on the 4/3 body, but you will only be able to use manual focus and need to work in aperature priority or fully manual mode. A ...