problem with zap's solution to my initial question
when you change the transparency colour, you still can't see the environment through the sky portal, it is now just black ?? i have a panoramic bitmap in my environement slot but nothing is showing. The blown out effect is fixed however so

and
and aj it maybe crude, but these are tips that help people like me out when we struggle for ages to get the result that i want, we may not think to do it like that although it works for what we want