Posted By Mark Costello III
I've had an enhanced star diagonal for almost six years that I've used for about 600-900 hours. Having recalled reading a post here that enhanced star diagonals will degrade over time, I'm wondering if it's time to replace it. If its reflectivity out of the box was 98% (it's a 2004 William Optics 2" diagonal), how long would it take for it to deteriorate to a reflectivity of less than 87%?
If I have to replace it, I'll do it with a dielectric star diagonal which I understand won't deteriorate significantly over time. Is this correct?
Thanks in advance for your responses and advice.