My first 30 minute sub exposure of the Horsehead Nebula. Posted on December 21, 2014 by astrolavista Taken in HA and processed in pseudo color in Photoshop. This single exposure was taken with the QSI 583wsg camera on the Celestron C11 EdgeHD at f7. An updated photo that shows the impact of stacking a few additional narrowband images. Share this:TwitterFacebookLike this:Like Loading...