Here's a trick that I discovered the other day for enhancing faint fuzzies, although it may have other uses too. Below is an original image taken on G7 a while back. LoTr5 (Longmore Tritton 5).



I happened upon this trick whilst running a Lucy-Richardson deconvolution script (I emphasize script, and not the inbuilt version that comes with the program) in Maxim on an image of Pickering's Triangle [post #3], but this example is probably the faintest image I have. Whilst running, the script just stopped, for whatever reason. As I was in the process of deleting the temp images produced in order to run it again I noticed the "background" image, which contained the nebulosity and just a couple of the brightest stars.
In order to test this further I opened the above image in Maxim, started the script, but closed the DOS window before it had finished. I kept the background temp image and closed all other temp windows, leaving the image below and the original.




These were combined (sum or average seem to work best) in a ratio of 3:2 (bg : orig). After a quick white and colour balance and setting the stretch to 'range' I got this image:



I don't really understand VB scripts, so this may actually be how deconvolution works. But having seen the result of a full deconvolution run (I got it to work properly eventually), this image is far superior.
Having posted this, I will probably find out it is just as easy to do exactly the same in Photoshop  :-[