A leader of a country thanking another country ' s representative isn ' t world news ? <| sep |> Some cameras are designed to have a base ISO different from ISO 100 . For example my OMD EM 5 is designed with a base ISO of ISO 200 , so there is no point shooting it lower than that as it leads to more or less the same noise but lower shutter speeds . Most camerassensors however are designed for a base ISO of ISO 100 . It ' s basically a design choice by the sensor manufacturer , which comes with some technical tradeoffs . In particular , your camera is designed with a base ISO of ISO 100 so there is nothing to worry about for you . The noise performance of your camera is also very linear so there are no sweet spots . Older cameras had more particularities but at this point in time there are no current sensor technologies with these kinds of spots any more besides the design choice of base ISO in very few cameras . Else the ISO is in practice the same as the theoretical performance so that discussion has become more or less irrelevant because of how good sensors have become .