NGC 3581 or ESO 129-EN9 is a very faint Diffuse Nebula in the constellation of Carina. This entire nebulous region is usually called NGC 3576 and includes the following NGC objects: 3579, 3582, 3584 and 3586, photo is centered on 3581.
Photo taken in the light of Ha (Hydrogen Alpha).
Takahashi Sky 90 operating at f/4.5 and an Astrondon 6Nm, Ha filter.