[graham.hobart (Graham stevens)]

Will try it tonight H, and let you know.
Weird thing is -is that it seems to be ok on other sets, managed to do 47x lum ,G, R, and B as individual panes then combine them with another object taken with same set up.

I don't know if it is an intermittent niggle or if there is more field rotation lower down in the West which is preventing an alignment.