Hi UniPol
I very much appreciate the feedback as I suspect both are excellent diagonals. I have looked at the links and once you get past the advertisement verbage the only real difference listed between the two I seem to discern is the following:
"high precision 15mm thick mirror substrate flat for optimal image stability."
So please correct me if I am wrong here but am I meant to take from this that a 15mm thick (presumably non-quartz) mirror in the Durabright is meant to be better than the WO quartz mirror diagonal?