OK. I have the M and I have the adapter. Looking out the window, I see a practically full moon. So I put the 100-400 on the M. No tripod. Shooting out of camera jpeg and not RAW. I know I can do better. But, I wanted to see how it would handle. Leaning against the wall, I tried AF. Forget it, unless you like hunting.The noise is due to the high ISO. Why do you need f11? Use the largest aperture. Get the ISO to about 400 or below. A tripod would help no doubt but you can hand-shoot the moon. What lens did you have? Can't read Exif on the iPad.
So, manual focus with a magnified "live view" and I got this......
iso 6400; 1/1250; f11
Makes me think that with a tripod, a bit of time, and PP on a RAW image with some noise reduction, this little camera won't be bad at all.