Hi All
Here are some images I did a couple of nights ago plus a repro of Omega Centauri from earlier in the month. When processing the three images from 26-02-09 I discovered radial noise patterns on the data. Has anyone any experience with this sort of thing and what may have caused it. It's very annoying ... made processing a lot harder ... in fact probably screwed the images all together as it was imposible to remove effectively and the images are softer than they could be. The other thing about the noise was that with M83, a shorter exposure, there was less of this effect.
Any clues IIS GURUS ?
ic434 and ngc5128 are both 10x360 sec
m83 was 5x360 sec