I think everyone agrees that Quartz diagonals are very good but what I am very keen to know about is what is the idea or concept behind WO producing a 15mm thick non-quartz dielectric mirror diagonal. If there isn't any advantage or specific angle to it why would they bother making such a diagonal? Consequently, there has to be some sort of specific reason for the creation of the DURABRIGHT and I would be very interested to find out if anyone might know - It is not actually a cheap diagonal either - originally the durabright was the same price as the WO Quartz
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