Narrow band optical images of M 1–16 a seen in different emission lines. Top panel: M 1–16 as seen in Ηα+[Ν II] (left), [O III] (middle), and unsharp masked Ηα+[Ν II] (right) images obtained with MES in image mode. Bottom panel: Separated Hα (left) and [Ν II] (right) images obtained with the MEXMAN camera. Arbitrary contrast scales were set to all images to enhance the different features seen in the nebula. North is up and east is to the left in all of the images.