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Thanks Ivo. You have gone to a great deal of detail in your response that has made a great deal of sense. Maths not being my strong point, I did have to go back in thought to remember rules of average. Now I can understand the need for more lights to be stacked. I have been playing around with targets using lower ISO and longer exposure before error becomes a problem. I find my shots to have less noise and better contrast, all target related however. I have just built a light box and used it for the first time on Eta Carina. It does seem to help flatted the field better than combining a Blur background image.
I guess when you mentioned the shorter exposures staked allowing creation of longer exposure in the software, I am guessing this refers to allowing more data to be pulled from the image with Curves and processing without the introduction of more noise..
Thanks again for your info
Seeing Stars
mardy
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