O trabalho apresentado debate sobre uma experiência de formação continuada envolvendo professores do ensino médio da região de Bauru (SP), na qual uma Oficina de Lunetas foi realizada, complementando os saberes docentes sobre a astronomia. No textoé discutido sobre a importância do "saber" na formação docente, bem como são comentadas algumas etapas da montagem de uma luneta de baixo custo e apresentados resultados obtidos com a participação dos professores nas atividades propostas. Palavras-chave: astronomia, lunetas, ensino de física.This work reports on an experience of continual development courses for in-service teachers from some high schools of Bauru's (SP) region, for whom a specific workshop on assembling of refractor telescopes has been carried out in order to supplement their knowledge in astronomy. In the current article, the importance of the practice (or "knowing") in the context of their academic formation is discussed as well as some steps on the assembling of low cost refractor telescopes are described. The main results obtained from the participation of these teachers in the proposed activities are also presented.
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