The aim of this presentation is to highlight and exemplify some aspects of the relation between, children's perspectives and ethics, based on the way that theory can help in illuminating the relation in between them. The analysed material is part of the result in a larger study with interest in three-year-olds and cameras in preschool. Discussions about ethics, young children's voice and their participation in research has been present in childhood research over a number of years (Christensen & James, 2008; Eide, Hognerstad, Svenning & Winger, 2010). By taking the theoretical point of entry with new materialism and in particular together with Karen Barad (2003, 2007) and her agential realism, I understand the relation between the researcher and the children as flattened out (Jackson & Mazzei, 2012). The research material that is presented is part of a qualitative study with an ethnographic and post-qualitative (Lather, 2013; Lather & St Pierre, 2013) approach. Parents and children have approved to take part in the study, and the chosen theoretical framework offers ethical considerations throughout the whole research process (Lenz Taguchi, 2010). By applying theories to the research material emerges how intra-actions (Barad, 2007) in-between three-year-olds and cameras becomes a guide for the researcher and the following research process. The children become pathfinders showing changes in the understanding of both ethics and children's perspective in research. The result may be of interest not only for researchers, but also for both teachers and children in preschool.