Here are two threads where you should be able to get the full res raw fit data of 16 minute subs in 3nm NII i.e. Stacked and only corrected for darks and flats. 9 frames, 21 frames and 33 frames.
http://www.iceinspace.com.au/forum/s...d.php?t=111601
http://www.iceinspace.com.au/forum/s...=112594&page=2
Here is an animated gif showing the improvement from nine frames to twenty one.
http://d1355990.i49.quadrahosting.co.../lmc_9vs21.gif
In my opinion more frames would improve the signal to noise even over the 33 frame stack. Unfortunately weather always beats greed!
By the way 16 minutes at f/3 collects the same number of target photons per pixel as 44 minutes at f/5. With about a third of the thermal noise.
This thread has been very interesting so far.
Bert