>>4458572
If you set up a static shot on a tripod and be really fucking careful not to nudge it when you take the photos (or use a remote), you can AHDR stack them in any photoshop-type software using an averaging-merge method.
The idea is that because noise is "random" but your scene isn't moving, you take fractions of the exposure for each shot and combine them to get a final result with the correct exposure. The noise on the other hand, because it's never really in the same place, gets cut away bit by bit because you're only using fractions of the noise data and each frame doesn't reinforce the others. I've only ever seen this as useful in landscape shots and even then there's lots of caveats, but it IS effective.

It's as easy as takling four frames, stacking them on top of each other, and changing opacity to 50/33/25/20% from top layer to bottom. You can do more frames but it's just more of the same.
My shiny new R8 can do it as well, as can basically anything that isn't majorly Canon crippled

>pic rel is a yuge crop of a nothingburger test shot, but shows the result. This is a RAW/TIFF without any NR.