Veil Nebula, NGC 6992, by Thierry Guillot. Vesta Pro Webcam (grayscale), raw mode and trichromy, focused on a Takahashi FS 60/350 and gpdx mount: it's a real trichromy with luminance. The 4 layers are additions of 30 images, 60" exposure each. Softwares : acquisition with astrosnap, image processing with Iris and Photoshop.