Renewing Field Work through Photography, Cooperation between an Ethnologist and a Photographer: This article is dedicated to the discovery of sensitive worlds rich in import for the analysis of social representations. At its origin is a joint research project of an ethnologist and a photographer in industrial anthropology. The article describes the development of the research project where pictures were used not only as a means of illustration but with the intention of obtaining a better understanding of this field work. Indeed, certain sectors are barely explorable with "classic" qualitative and quantitative means (interviews, observations, questionnaires). In our perspective, the enthnologist's work should facilitate the passage "from the visible to the readable", but it should be able to address the invisible -- invisible for the researcher and often even for the informant -- and the non-expressible without mediation.