Here's 8x900s + 10x60s for the core in Ha on M42. Too close to the full moon and a little noisy. My flat fielding is improving but I'm not 100% there yet. I also have little light leaks in my camera around the sensor that I've since sorted out. The full frame is available at
http://www.multiweb.com.au/astro/M42_ha_cf.jpg
Thanks for loooking. Comments/tips most welcome.