This is a feature that I have considered sadly lacking, but it appears it is possible. From the DPR Guide..User Guide: Getting the most out of the Olympus E-M5: Digital Photography Review By default, Auto ISO is concerned about camera shake and will push the sensitivity up when it reaches 1/Effective Focal Length or 1/60th, whichever is faster. However, the lower limit threshold can be raised, for instance if you're trying to retain fast enough shutter speeds to freeze action. The 'Flash Slow Limit' setting in Custom Menu F effectively sets this threshold. It's not a documented feature, but it's worth knowing.