In a year or two I'll probably think this is a lousy pic, but it's my best Orion Nebula to date. I am deliberately shooting it in the cool of the morning to try and keep thermal noise down as it never gets really cold here in the tropics. Soon winter will be gone and I won't be able to image anything for noise.
I am too lazy to keep accurate records, I've just been nibbling at it a bit each night while waiting for comets to rise. It's about 4 hours worth through the SW ED100 with Orion focal reducer making it F7.2, unmodified Pentax K-5. Subs in various lengths up to a max of 5 minutes. HEQ5 pro, guiding with PHD2.
Bigger --->
http://astrob.in/118167/0/