SH2-223 (Sharpless 223 ) This faint but nice size nebula needs a long exposure to capture it so it overtakes the background sky. The nebula response well to hydrogen-alpha but you need lots of color exposure time to colorize the nebula for an HA-RGB image. The fainter part of the nebula extends beyond the top of the image so a wider field of view can pick up more. SH2-224 is also nearby so you can easily capture both of them with the right setup. I tried the OIII filter but nothing picked up in the 15 minute exposure I took. For a complete list of the Sharpless Catalog visit my main site at http://www.sharplesscatalog.com