The Kodak max versatility plus 800 dont pass my tests :( The milkyway is too turquoise ... the nebula are red but maybe this film is better at prime focus. and for the northern lights it's the worst film that I've tried It's a chance that I dont used it on a geomagnetic storm !!!! I've done the same work under photoshop that I do with all my other photos : unsharp-mask , and I play a litle bit with levels , that's all ! I try to show exactly what I have on my photos. You can see the results here
http://astrosurf.com/aurores/test.htm , the details are under each picture.