This is an HaRGB composite image, which means I took to image sequences one with the filter and one just RGB without filter, those were then combined in photoshop.

This is an image I've been wanting to get for a long time!! It includes two amazing deep sky objects the Orion and Horsehead nebula with increased ha details from the ha filter. I took this shot on a very cold night, about -2f. Hope you enjoy it and clear skies!