So it finally stopped raining in northern California and I was eager to take a few shots of the Andromeda galaxy with my epm2 and 25mm 1.8. I obviously did not do a good job centering the galaxy in the middle of the screen...but it was hard to do without a tilting screen. I wanted to compare the noise level of a single exposure vs multiple exposures of the same length stacked using Regim. The single exposure (unguided) is 10 seconds at ISO 1,600 and the stacked picture consists of 11 10-sec light frames and 9 dark frames stacked using Regim software for mac. This was the first time I used the program, so I wasn't sure how well it would work. First of all, I am amazed at how much light the 25mm 1.8 lens gathers...But the main reason for this post is to compare the the noise level of a single shot vs stacked images and see if micro four thirds presents a good option for astrophotography when used with powerful softwares such as Regim. I did notice that the program doesn't work if the noise reduction setting is on, something very interesting. Also, even though it did processed the images in RAW it did not manage to produce me a final image, but it did after I changed them from RAW toTiff format. The images have not been post-processed. Feel free to comment as I am curious to hear about other's experience with using Regim for astrophotography.