[PRejto (Peter)]

Originally Posted by Joshua Bunn

Hi Peter.

Does the below link help as i see you have what looks like a hotspot in your flat... looks like its in your final image to.
http://www.sbig.com/about-us/blog/fl...he-ugly-truth/

Josh

Thanks Josh! That is a most illuminating article. I'm pretty sure this is my problem. I speculate now that my blue images are showing this effect because the contrast is lowest and light pollution is now a greater % of the image. That + IR reflection off the tubes in the imaging train. I guess I need to wonder if these new blue filters are actually blocking IR sufficiently.

Peter