Here is my recent attempt at imaging the very rich Hydrogen alpha field including IC 4628, Barnard 48 (bottom left) and the two open clusters NGC 6268 (top left) and NGC 6242 (top, right of center). This is a two part mosaic of 25 x 900 sec exposures (east panel) and 18 x 900 sec exposures (west panel) using my NP127is at f/4.2 and a QSI 683wsg cooled to -22 Celsius with an astronomic H alpha filter. The 198 kB thumbnail attached to this IIS post does little justice to the original 4253 x 3273 pixel (~3 x 2 Degree) image:
https://flic.kr/p/uiNHbK