I tried re-editing my last photo of the Orion and Running Man nebulae. This image is still a single exposure so it lacks the flexibility of a stacked series of images, but I did manage to bring out more of the nebulosity detail than I ever have. However, it did introduce a lot more noise. Shooting multiple frames would smooth this out more. I'll definitely dedicate an entire night of shooting to this nebula the next time conditions allow. The image on the bottom right is the first image I ever took of this using my D600 and the nikkor 70-300mm lens.

D600
Imaging - Orion 8" f/3.9 Astrograph
Guiding - Orion ST-80 guidescope with Orion SSAG Autoguider
Celestron CGEM tracking mount
ISO 800
200 second exposure
Stretched in Photoshop
Also...
This was a small stack of light, dark, and bias frames I took last night. The editing was done while I was fighting sleep, so I need to look into redoing it soon. I may try a different program as well to preserve more of the color. Anyway...

D600
Imaging - Orion 8" f/3.9 Astrograph
Guiding - Orion ST-80 guidescope with Orion SSAG Autoguider
Celestron CGEM tracking mount
ISO 800
8x200 seconds for light frames (total exposure of 26.6 minutes)
5x200 seconds for dark frames
20x1/4000 second for bias frames.
Stacked in Deepskystacker and tweaked in Lightroom. I'll try Nebulosity next time.