im thinking of buying the lens on ebay go to adorama.com
type in name of camera
it will give you a list of lenses What lens? You don't tell us. It will only fit an Olympus OM1n if it has an Olympus mount. If it is made by any of the other camera manufacturers it definitely won't fit as they only make lenses to fit their own cameras. If it is made by one of the independents (Sigma, Tamron etc.) then the e-bay ad should tell you what camera it is designed to fit. Again, if the ad does that, and says, e.g., Canon, fit then it won't fit your Olympus. | 